Oort Archives

The Oort Archives are part of the Leiden Observatory Archives and reside at the Leiden University Library, department Special Collections. The files below follow the inventory of the Oort Archives by Jet Katgert-Merkelijn, see her book The Letters and Papers of Jan Hendrik Oort (cover illustrated above). The listings and headings below have been copied directly from her book with a few very minor changes.

The pdf files below have been produced from photographs that I took with an iPad during about 75 days of examination of the Archives. I first reduced these 2 by 2 pixels to make the size manageable, which was then followed by collection in pdf-format per archive item. The original images are kept by me at my personal account in Groningen.

The coverage is far from complete and the selections are mine on the basis of what I felt useful to include for my own use. Especially the enormous amount of research notes has not been recorded; only pages that contained something particularly important were included. From those files I did record all letters and often drafts of papers. I included the full lecture notes of the two courses that I followed.
There were two sets of letters. From the general correspondence letters were only included when I felt they were useful for my purpose. The correspondence with individuals that are collected in separate archive items, has usually been included completely.
For the administrative files I have included most of the correspondence, but other documents only when relevant for me in writing the biography.

The quality is variable. I have removed the worst pictures from the collection, but some are poor but still (sometimes barely) good enough to use.

Some parts of the archive are confidential and not open to the public and access requires written permission from the Librarian of Leiden University. This applies to the correspondence between Oort and Th. Walraven (item 198) and Oort's private archives (items 342 through 362). The links are included in the Webpage below, but there are no files associated with it.

The number of pages between brackets are those in the pdf-files. This may be used as an indication of the level of coverage by comparing to the descriptions in Jet Katgert-Merkelijn's book.
The total number of pages on this Webpage is 27,081, of which 3,354 are in the private Oort archives section and 841 in the Walraven correspondence.

I hope that in spite of all the shortcomings this collection is of some use for the time being, until the Oort Archives are available directly from the Universiy Library Leiden in electronic form on the Web.

The files are reproduced here with permission of Leiden University Library. I am grateful to the staff of the department Special Collections for their excellent support, help and assistance during my many visits.

Note: Arnold Schalks, visual writer and artist from Rotterdam, has provide transcrips of a large fraction of the correspondence contained in the files under the heading 3.7. Kenya Expedition (228-231). These are all in Dutch. It can be downloaded by following this link.



Index of headings
1. Research and teaching (1-93)
2. Correspondence
3. Leiden Observatory
4. Leiden University
5. Astronomy in the Netherlands
6. Netherlands
7. Europe
8. International
9. Personal Archive There are limitations to the consultation of these files;
written permission from the Librarian of Leiden University is required.


1. Research and Teaching

1.1 Research, general (1-58)
1.2 Specific research for special lectures (59-64)
1.3 Book reviews, biographies, etc. (65-67)
1,4 Popular lectures and articles (68-73)
1.5 Courses of lectures at Leiden Observatory (74-76)
1.6 Other lectures (77-81)
1.7 Research of colleagues and students (82-87)
1.8 Lecture notes when a student (88-89)
1.9 Chapter 21 of Stars and Stellar Systems V; book (90-92)
1.10 Notes on literature (93)

1.1 Research, general (1-58)

1. NOTES ON THE DENSITY LAW AT DIFFERENT GALACTIC LONGITUDES, 1921-1924 (70 pages)
Proper motions - J. Schilt - Astrometry

2. EARLY RESEARCH. THE TIMING OF TIDES. NOTES MADE AS A STUDENT, ON GLOBULAR CLUSTERS, ATOMIC THEORY, STELLAR DYNAMICS, ETC., 1919-1924 (20 pages)
Proper motions - H. Marsh - Astrometry

3. NOTES ON THE VELOCITIES OF BINARY STARS, 1923-1924 (4 pages)
Stellar motions

4. OBSERVATIONS FOR THE DETERMINATION OF FUNDAMENTAL DECLINATIONS, 1922-1925 (12 pages)
C.H. Sanders - W. de Sitter - Astrometry

5. MISCELLANEOUS THESIS MATERIAL, 1925-1926 (50 pages)
High-velocity stars - Globular clusters

6. 'ALTITUDE-RADIATION' (I.E. COSMIC RAYS), ORBITAL PLANES OF ECLIPSE VARIABLES, PARALLAXES OF RR LYRAE STARS, POLARISATION OF NEBULA LIGHT, ABSORPTION IN THE GALACTIC PLANE, GALACTIC DISTRIBUTION OF SPECIAL TYPES OF STARS AND OF PLANETARY NEBULAE. LISTS OF C-STARS AND DARK NEBULAE, 1926-1927 (26 pages)
Special lecture - Stellar dynamics - Galactic structure - Interstellar matter

7. DETERMINATION OF DIFFERENTIAL GALACTIC ROTATION, 1927-1930 (40 pages)
Stellar dynamics - Galactic structure - Galactic centre - Precession constant - Proper motions

8. INVESTIGATIONS TO DISTINGUISH THE VARIOUS DYNAMICAL COMPONENTS OF THE GALACTIC SYSTEM, 1926-1934 (46 pages)
Calcium lines - Early-type stars - High-velocity stars - Proper motions - Solar motion

9. REDUCTION OF LATITUDE OBSERVATIONS WITH ZENITH CAMERA AT YALE, 1923-1929 (12 pages)
G. Pels - F. Schlesinger

10. SURFACE PHOTOMETRY AND DETERMINATION OF THE ROTATION OF EXTERNAL GALAXIES, 1930-1933 (77 pages)
Stellar dynamics - Clusters of galaxies - Perkins Observatory - Spiral structure

11. MISCELLANEOUS NOTES, MOSTLY ON ABSORPTION AND GALACTIC STRUCTURE, 1937-1945 (7 pages)
Interstellar matter - Calcium lines

12. MISCELLANEOUS NOTES: ON THE BINARY CHARACTER OF POLARIS, ON THE URSA MAJOR STREAM, ON THE EXTENT OF THE HYADES CLUSTER, ON RZ CAS, ON GALACTIC CLUSTERS, ON G. VAN HERK'S THESIS, ON THE ROCKEFELLER GRANT, 1926-1944 (96 pages)
Calcium lines - Moon

13. DISTRIBUTION OF DENSITY AND VELOCITY IN THE DIRECTION PERPENDICULAR TO THE GALACTIC PLANE. DETERMINAnON OF Kz, 1930-1932 (76 pages)
Local mass density - Stellar dynamics

14. MEAN PARALLAXES OF FAINT STARS (FROM RADCLIFFE PROPER MOTIONS) AND THE DETERMINATION OF PRECESSION AND ROTATION FROM McCORMICK PROPER MOTIONS, 1936-1937 (29 pages)
Astrometry - Galactic rotation - Precession constant

15. DETERMINATION OF INTERSTELLAR ABSORPTION FROM THE COLOUR EXCESS FOR OPEN AND GLOBULAR CLUSTERS, AND FROM GALAXY COUNTS, AND DERIVATION OF THE DISTRIBUTION OF THE INTERSTELLAR GAS IN THE GALAXY, 1936-1938 (36 pages)
Interstellar matter - Galactic structure - Special lecture

16. MISCELLANEA: HARVARD LECTURES, DISCUSSION ON TURBULENCE, WALRAVEN PHOTOMETER, DISCUSSION WITH H.G. VAN BUEREN ON HYADES CLUSTER, S. CHANDRASEKHAR, 1939-1954 (68 pages)
Book reviews - Stellar dynamics - Photometry

17. NOTES ON: INTERSTELLAR LINES, RADIAL VELOCITIES OF CEPHEIDS, ZERO POINT OF THE PERIOD-LUMINOSITY LAW. NOTES FOR ARTICLE ON STELLAR MOTIONS. DATA ON O- AND EARLY B STARS, 1934-1944 (70 pages)
Calcium lines - Absorption - Galactic structure - Stellar dynamics - External galaxies - M31 - NGC1068 - Solar motion

18. MISCELLANEOUS NOTES FOR RESEARCH ON GALACTIC STRUCTURE AND ON FUNDAMENTAL SYSTEMS, 1941-1943 (37 pages)
Galactic centre - Galactic pole - Galactic rotation - P.Th. Oosterhoff - J.J.M. van Tulder - Velocity distribution - Density distribution - Long-period variables - Precession constant - Astrometry - Proper motions - RR Lyrae variables - Mean parallaxes

19. IDENTIFICATION OF THE CRAB NEBULA WITH THE SUPERNOVA OF 1054, 1939-1942 (37 pages)
N.U. Mayall - J.J.L. Duyvendak

20. MISCELLANEOUS NOTES ON THE FORMATION OF SOLID PARTICLES IN INTERSTELLAR SPACE. GEORGE DARWIN LECTURE, 1941-1946 (89 pages)
Interstellar matter - H.C. van de Hulst - Special lecture

21. MORPHOLOGY AND INTERNAL MOTIONS OF PLANETARY NEBULAE, 1930-1939 (5 pages)

22. THE NEBULOSITY AROUND NOVA PERSEI 1901, 1943-1948 (51 pages)

23. ORIGIN OF COMETS: MISCELLANEOUS WORK NOTES, DATA, CORRESPONDENCE, 1947-1951 (146 pages)
M. Schmidt - Special lecture - A.J.J. van Woerkom

24. ASTRONOMICAL CONSTANTS, 1951 (25 pages)
Astrometry

25. WORK NOTES ON THE DETECTION OF THE 21-CM HYDROGEN LINE; FIRST ATTEMPTS TO DERIVE THE SPIRAL STRUCTURE OF THE GALAXY, 1951-1955 (167 pages)
Galactic rotation - Solar motion - H.C. van de Hulst - C.A. Muller - Kootwijk

26. NOTES FOR ARTICLES ON THE DYNAMICS OF NGC 3115 AND ON DARK RINGS IN GALAXIES, 1933-1975 (321 pages)
External galaxies - C.J. van Houten - W.A. Hiltner - Stellar dynamics - Velocity dispersion - Elliptical galaxies - Photometry

27. WORK NOTES ON O-TYPE STARS, INTERSTELLAR CLOUDS AND THEIR INTERACTION, 1951-1955 (161 pages)
O-associations - L. Spitzer

28. WORK NOTES FOR RESEARCH ON THE CRAB NEBULA, 1954-1957 (110 pages)
Polarization - Th. Walraven

29. VARIOUS NOTES ON M/L RELATION, ON MASS DENSITY IN CLUSTERS AND IN THE UNIVERSE,1958-1961 (53 pages)
Clusters of galaxies - Cosmology

30. RESEARCH NOTES AND LECTURE NOTES, RELATED TO THE NEUTRAL HYDROGEN NEAR THE GALACTIC CENTRE. COMMENTS ON G.W. ROUGOOR'S WORK; OBSERVING PROGRAMMES AND ITEMS FOR FUTURE WORK, 1958-1963 (26 pages)
H. van Woerden - Photomultiplier

31. NOTES ON STELLAR_DYNAMICS AND DENSITY OF THE UNIVERSE, 1959 (9 pages)
G. van Herk - Globular clusters - Galaxy model

32. WORK NOTES ON THE DETERMINATION OF Kz, 1956-1960 (16 pages)
Stellar dynamics - Galactic structure - E.R. Hill

33. NOTES ON SOURCE-COUNTS AND THE DENSITY OF THE UNIVERSE, 1961- 1963 (43 pages)
WSRT - Radio sources - Cosmology

34. WORK NOTES ON HIGH-VELOCITY CLOUDS, CORRESPONDENCE ON COLLABORATIVE PAPERS, NOTES FOR SEMINARS, 1963-1973 (374 pages)
21-cm hydrogen line - C.A. Muller - E. Raimond - A.N.M. Hulsbosch - Galactic halo - Galactic structure - Formation of galaxies - U.J. Schwarz - Magellanic Stream - Calcium lines - A stars - Absorption

35. MISCELLANEA: MOSTLY ON SPIRAL STRUCTURE, RADIO SOURCE EVOLUTION, APOLLO PROJECT, 1964-1972 (2 pages)
Evolution of galaxies - quasars - Density of Universe - Gamma radiation - Lecture notes

36. NOTES ON THE FREQUENCY OF SUPERNOVAE, AND ON THE PROGRAMME TO DETECT YOUNG SUPERNOVAE IN EXTERNAL GALAXIES, 1969-197 I (12 pages)
P. Katgert - A.G. de Bruyn - E. Dekker

37. WORK NOTES FOR PAPER ON THE AMPLIFICATION OF RADIO EMISSION IN HVC's, CORRESPONDENCE WITH CO-AUTHOR H.G. VAN BUEREN, 1967-1968 (11 pages)
21-cm hydrogen line - High-velocity clouds

38. ORIGIN OF GALAXIES IN RELATION TO THE HIGH-VELOCITY GAS, 1966-1970 (43 pages)
Formation of galaxies - High-velocity clouds

39. NOTES ON RADIO SOURCE COUNTS, WORLD MODELS, DENSITY OF THE UNIVERSE, ETC., 1957-1973 (23 pages)
Cosmology - Virgo cluster - Clusters of galaxies- Orientation of galaxies

40. OBSERVATIONS OF MAFFEI I, 1970-1971 (16 pages)
Nearby galaxies

41. WORK NOTES AND CORRESPONDENCE ON NGC 4258, 1971-1980 (131 pages)
Radio astronomy - Spiral structure - External galaxies - P.C. van der Kruit - D.S. Mathewson

42. MISCELLANEOUS WORK NOTES, 1955-1979 (17 pages)
21-cm hydrogen line - Formation of galaxies - NGC 1068

43. WESTERBORK OBSERVATIONS OF NEARBY GALAXIES, 1974-1982 (109 pages)
WSRT - M31 - 21-cm hydrogen line

44. DATA ON RR LYRAE VARIABLES; CORRESPONDENCE ON ARTICLE BY G. VAN HERK. WORK NOTES ON RR LYRAE VARIABLES AND ON GALACTIC HALO POPULATION IN GENERAL, 1953-1963 (216 pages)
Galactic rotation - L. Plaut - Mt. Wilson

45. RESEARCH NOTES ON THE HYADES CLUSTER AND OTHER GALACTIC CLUSTERS (E.G. PLEIADES), 1956-1975 (196 pages)
G. Pels - H.A. Pels-Kluyver

46. PLANETARY NEBULAE, 1974-1976 (34 pages)
Galactic centre

47. NGC 1275, 1974-1977 (78 pages)
Seyfert galaxies - Nuclei of galaxies - 21-cm hydrogen line

48. SURFACE DENSITY OF GLOBULAR CLUSlERS NEAR THE GALACTIC CENTRE, 1976-1977 (32 pages)

49. NOTES FOR REVIEW ARTICLES ON THE GALACIlC CENTRE. 1974-1985 (265 pages)
21-cm hydrogen line - Small spiral - Galactic structure - CO lines

50. HIGH-VELOCITY CLOUDS, ESPECIALLY CHAIN A, 1968-1988 (137 pages)
Magellanic stream - Galactic centre

51. LY-α ABSORPTION IN SUPERCLUSTERS, 1980-1981 (45 pages)
Quasars

52. WORK NOTES ON THE ASSOCIATION OF QUASARS WITH SUPERCLUSTERS AND RELATED SUBJECTS (E.G. POS'ON ANGLES OF NEAR NEIGHBOURS), 1980-1983 (101 pages)
Radio sources - Orientation of galaxies

53. EXTRAGALACTIC RADIO SOURCES, 1980-1981 (15 pages)
Radio galaxies - Nuclei of galaxies

54. NOTES FOR ANNUAL REVIEW ARTICLE AND LATER PAPERS ON SUPERCLUSTERS, 1980-1984 (226 pages)
Clusters of galaxies - Distribution of galaxies - Formation of galaxies

55. PROTOSUPERCLUSTERS AND PANCAKES, 1983-1984 (72 pages)
Superclusters - Formation of galaxies

56. ASSORTED WORK NOTES, 1984-1992 (10 pages)
Superclusters - Galactic centre - WSRT

57. LATER WORK ON THE GALACTIC CENTRE AND THE POSSIBLE PRESENCE OF A BLACK HOLE, 1985-1990 (9 pages)
Galactic centre

58. RESEARCH NOTES ON COMETS AND THEIR COMPOSION, ON THE EXTENT OF THE COMET CLOUD AND ON HALLEY'S COMET, 1985-1990 (100 pages)
Giotto - lnterview - Popular lectures

1.2 Specific research for special lectures (59-64)

59. NOTES ON THE EVOLUTION OF THE GALACTIC SYSTEM AND ON THE DENSITY-WAVE THEORY, 1963-1972 (12 pages)
Galactic structure - Galactic evolution - Special lecture - Galactic centre - Galactic halo - Galactic rotation - Spiral structure

60. X-RAY SOURCES, 1970-1971 (7 pages)
Cygnus X - WSRT

61. NOTES FOR SEMINARS AND REVIEW ARTICLES ON THE GALACTIC CENTRE. CRITICAL COMMENTS ON SYMPOSIUM CONTRIBUTIONS, ARTICLES AND RESEARCH OF DOCTORAL STUDENTS, 1966-1974 (63 pages)
21-cm hydrogen line - P.C. van der Kruit - Galactic structure - Lecture notes

62. THE GALACTIC DISTRIBUTION OF OH/IR STARS, 1978-1979 (22 pages)
Galactic centre

63. ENCICLOPEDIA ITALlANA, 1970-1979 (58 pages)
Interstellar matter

64. KYOTO LECTURE AND ADAPTATION FOR ZENIT, 1988-1991 (31 pages)
Structure of the Universe

1.3 Book reviews, biographies, etc. (65-67)

65. VARIOUS REVIEWS, 1931-1949 (11 pages)
Book reviews - G.P. Kuiper - W.M. Smart - T. Gehrels

66. HISTORY OF MODERN ASTROPHYSICS, 1976-1985 (10 pages)
History - Interview

67. CONTRIBUTIONS TO FESTSCHRIFTE AND SPECIAL OCCASIONS, (AUTO)BIOGRAPHICAL LECTURES AND ARTICLES, MEMORIAL ARTICLES, 1978-1987 (94 pages)

1.4 Popular lectures and articles (68-73)

68. POPULAR LECTURES AND REVIEWS, 1920-1985 (244 pages)
Popular lectures - Lecture notes

69. ARTICLES FOR SCIENTIFIC AMERICAN, 1956-1957 (25 pages)
Stellar dynamics - Crab Nebula

70. NOTES AND CORRESPONDENCE RELATING TO INTERVIEWS, ESPECIALLY FOR BBC AND MARKANT, 1967-1989 (111 pages)
Interview

71. VARIOUS POPULAR ARTICLES, 1970-1979 (27 pages)
WSRT- ESO

72. ARTICLES FOR NATUUR EN TECHNIEK, 1975-1991 (90 pages)

73. NOTES AND CORRESPONDENCE ON ARTICLE WRITTEN FOR ZENIT, 1984 (15 pages)

1.5 Courses of lectures at Leiden Observatory (74-76)

74. NOTEBOOKS FOR COURSES OF LECTURES, 1927-1946 (27 pages)
Stellar astronomy - Clusters - Galaxies - Moon - Lecture notes - Stellar dynamics

75. EXAMINATIONS OF ASTRONOMY STUDENTS, 1940-1970 (7 pages)

76. NOTEBOOKS FOR COURSES OF LECTURES, 1948-1970 (116 pages)
Galactic structure - Comets - Planetary system - Stellar dynamics

1.6 Other lectures (77-81)

77. LECTURES FOR STUDIUM GENERALE, 1952-1954 (43 pages)
Lecture notes

78. NOTES FOR VARIOUS SEMINARS ON V.A. AMBARTSUMIAN'S THEORIES, 1964-1975 (8 pages)
Nuclei ofgalaxies - Clusters of galaxies - Evolution of galaxies - Lecture notes

79. NOTES FOR SEMINARS FOR THE NAC, 1964-1965 (7 pages)
Radio astronomy

80. SEMINARS FOR LEARNED SOCIETIES, 1970-1976 (6 pages)
KNAW - Bataafs Genootschap - Natuurkundig Genootschap - Active galaxies

81. LECTURES ON NEW WESTERBORK RESULTS, 1972 (38 pages)
WSRT - Spiral structure - Nuclei of galaxies - Spiral galaxies

1.7 Research of colleagues and students (82-87)

82. RESEARCH CARRIED OUT BY COLLEAGUES, 1952-1959 (5 pages)
M31

83. RESEARCH PROGRESS OF LEIDEN OBSERVATORY SENIOR SCIENTISTS, 1964-1970 (47 pages)

84. COMMENTS ON THE RESEARCH PROJECTS OF VARIOUS PH.D. STUDENTS AND POSTDOCTORAL FELLOWS, 1964-1972 (106 pages)
J. Tinbergen - K. Robinson - W.J. Jaffe - V. Icke - E.M. Berkhuijsen - R. Sancisi - S. Vaghi - W.B. Burton - B. van Leer - J.K. Merkelijn - A.M. van Genderen - M.E. Kepner - W.W. Shane

85. NOTES ON RESEARCH OF STUDENTS, 1967 (129 pages)

86. COMMENTS ON PH.D. THESES, 1971-1985 (72 pages)

87. RESEARCH CARRIED OUT BY COLLEAGUES, 1973-1990 (141 pages)
Barred spirals - Radio galaxies - Radio sources - Source counts - High-velocity clouds - Clusters of galaxies

1.8 Lecture notes when a student (88-89)

88. NOTES OF LECTURES OORT FOLLOWED AS A STUDENT, 1921-1926 (131 pages)
Lecture notes - J.C. Kapteyn

89. NOTES OF OBSERVATORY SEMINARS AND DISCUSSIONS, 1980-1988 (5 pages)

1.9 Chapter 21 of Stars and Stellar Systems V; book (90-92)

90. NOTES AND MANUSCRIPTS FOR BOOK ON STELLAR DYNAMICS, 1939-1957 (120 pages)
Waynflete lectures - Lecture notes - Harvard - Stellar dynamics

91. CORRESPONDENCE AND SOME MATERIAL FOR STARS AND STELLAR SYSTEMS, VOL. V, CHAPTER 21, 1960-1966 (48 pages)
Chapter 21 of 'Stars & Stellar Systems', Vol. V - M. Schmidt - A. Blaauw - B. Strömgren

92. BASIC NUMBERS AND FORMULAE, 1980 (12 pages)

1.10 Notes on literature (93)

93. SCIENTIFIC READING NOTES, 1945-1983 (50 pages)

2. Correspondence

2.1 General correspondence (146-191)
2.2 Personal correspondence (192)
2.3 Strange letters and wild theories (94-145)
2.4 Correspondence with foreign visitors (193)
2.5 Correspondence on travel arrangements (194)
2.6 Correspondence on projects financed by ZWO (195-196)
2.7 Letters of recommenradion (197)

2.1 General correspondence (94-145)

94. MISCELLANEOUS CORRESPONDENCE, 1941 (16 pages)

95. MISCELLANEOUS CORRESPONDENCE, 1942 (13 pages)

96. MISCELLANEOUS CORRESPONDENCE, 1943 (23 pages)

97. MISCELLANEOUS CORRESPONDENCE, 1944 (10 pages)

98. MISCELLANEOUS CORRESPONDENCE, 1945 (99 pages)
Liberation - Bruce Medal- Succession E. Hertzsprung - Kenya - Nova Persei 1901

99. MISCELLANEOUS CORRESPONDENCE, 1946 (45 pages)
Kenya - Lembang - Bruce Medal - George Darwin Lecture - Tycho Brahe commemoration

100. MISCELLANEOUS CORRESPONDENCE, 1947 (168 pages)
Kenya - USA

101. MISCELLANEOUS CORRESPONDENCE, 1948 (104 pages)
IAU - Kenya - USA - Comet Keuskamp - South Africa

102. MISCELLANEOUS CORRESPONDENCE, 1949 (46 pages)
Lembang - Paris symposium - Kenya - Comets - Th. Walraven - St. Michel

103. MISCELLANEOUS CORRESPONDENCE, 1950 (87 pages)
Comets - Lembang - South Africa - Special Lecture - Photomultipliers

104. MISCELLANEOUS CORRESPONDENCE, 1951 (153 pages)
Special Lecture - Comets - lAU - 2l-cm hydrogen line - USA visit - Egypt

105. MISCELLANEOUS CORRESPONDENCE, 1952 (95 pages)
21-cm hydrogen line - Australia - USA - South Africa - Photomultipliers - Comets

106. MISCELLANEOUS CORRESPONDENCE, 1953 (60 pages)
ESO - Liège - Groningen conference - Flood - Comets

107. MISCELLANEOUS CORRESPONDENCE, 1954 (123 pages)
Pulkovo - ESO - 21-cm hydrogen line - Dwingeloo telescope - Photomultipliers - Comets

108. MISCELLANEOUS CORRESPONDENCE, 1955 (136 pages)
Crab Nebula - Kz - ESO - Dwingeloo telescope - IAU

109. MISCELLANEOUS CORRESPONDENCE, 1956 (110 pages)
Dwingeloo telescope - Bonn telescope - Crab Nebula - Waynflete lectures - Cosmic rays

110. MISCELLANEOUS CORRESPONDENCE, 1957 (89 pages)
USA - Hartebeespoortdam - Crab Nebula - Vatican meeting - Colloquium Sweden - Sunspots - Visa Walraven

111. MISCELLANEOUS CORRESPONDENCE, 1958 (113 pages)
Princeton - Lick - RR Lyrae variables - M31 - Solvay conference - Paris symposium

112. MISCELLANEOUS CORRESPONDENCE, 1959 (78 pages)
IAU - IUCAF - Green Bank - Royal Society

113. MISCELLANEOUS CORRESPONDENCE, 1960 (103 pages)
ESO - G. van Herk - Honorary Degree Cambridge - Nijenrode

114. MISCELLANEOUS CORRESPONDENCE, 1961 (115 pages)
ESO - J. Ponsen - Princeton -IAU

115. MISCELLANEOUS CORRESPONDENCE, 1962 (22 pages)
ESO

116. MISCELLANEOUS CORRESPONDENCE, 1963 (46 pages)
South Africa - Chile - Australia - L. Woltjer - ESO

117. MISCELLANEOUS CORRESPONDENCE, 1964 (56 pages)
IAU - Solvay conference - Lagonissi summer school - ESO - R.A. Lyttleton - RR Lyrae variables - S. von Hoerner

118. MISCELLANEOUS CORRESPONDENCE, 1965 (53 pages)
B.J. Bok - O. Heckmann - H. Shapley - Mills Cross - Comet lkeya-Seki - B. Lindblad - RR Lyrae variables

119. MISCELLANEOUS CORRESPONDENCE, 1966 (54 pages)
Bruce Medal- RR Lyrae variables - Stockholm Observatory - Chile - USA - Vetlesen Medal

120. MISCELLANEOUS CORRESPONDENCE, 1967 (39 pages)
IAU - E. Hertzsprung - B. Lindblad

121. MISCELLANEOUS CORRESPONDENCE, 1968 (33 pages)
Pulsars - WSRT

122. MISCELLANEOUS CORRESPONDENCE, 1969 (106 pages)
Moon landing - Oort's constants - Ya.B. Zel'dovich - Crab Pulsar - History - Special Lecture Interview

123. MISCELLANEOUS CORRESPONDENCE, 1970 (35 pages)
Special Lecture - 70th birthday and retirement - Manchester - Ya.B. Zel'dovich

124. MISCELLANEOUS CORRESPONDENCE, 1971 (49 pages)
Retirement - NGC 4258 - Comets

125. MISCELLANEOUS CORRESPONDENCE, 1972 (77 pages)
External galaxies - Magellanic Stream - History

126. MISCELLANEOUS CORRESPONDENCE, 1973 (59 pages)
W. Baade - E. Levich - E.M. Burbidge - IAU - Magellanic Stream - F.L. Whipple

127. MISCELLANEOUS CORRESPONDENCE, 1974 (37 pages)
G.P. Kuiper - Lembang - Comet Kohoutek - ESO archives - Princeton

128. MISCELLANEOUS CORRESPONDENCE, 1975 (63 pages)
External galaxies - Soviet Union - WSRT - Annual Review

129. MISCELLANEOUS CORRESPONDENCE, 1976 (23 pages)
Galactic centre - WSRT - External galaxies - Annual Review

130. MISCELLANEOUS CORRESPONDENCE, 1977 (54 pages)
Annual Review - Galactic centre

131. MISCELLANEOUS CORRESPONDENCE, 1978 (44 pages)
History - P.Th. Oosterhoff

132. MISCELLANEOUS CORRESPONDENCE, 1979 (28 pages)
B.J. Bok

133. MISCELLANEOUS CORRESPONDENCE, 1980 (21 pages)
Superclusters

134. MISCELLANEOUS CORRESPONDENCE, 1981 (28 pages)
ESO - W. Baade - History -Interview

135. MISCELLANEOUS CORRESPONDENCE, 1982 (28 pages)
Superclusters - IAU - External galaxies - Comets

136. MISCELLANEOUS CORRESPONDENCE, 1983 (13 pages)
Galactic centre - IAU

137. MISCELLANEOUS CORRESPONDENCE, 1984 (44 pages)
Balzan Prize - ESO archives

138. MISCELLANEOUS CORRESPONDENCE, 1985 (27 pages)
Balzan Prize - Hale Observatories

139. MISCELLANEOUS CORRESPONDENCE, 1986 (10 pages)
Halley's Comet - Interview - History

140. MISCELLANEOUS CORRESPONDENCE, 1987 (44 pages)
Kyoto Prize

141. MISCELLANEOUS CORRESPONDENCE, 1988 (56 pages)
Interview

142. MISCELLANEOUS CORRESPONDENCE, 1989 (5 pages)

143. MISCELLANEOUS CORRESPONDENCE, 1990 (43 pages)
History

144. MISCELLANEOUS CORRESPONDENCE, 1991 (7 pages)
Low-frequency radio telescope

145. MISCELLANEOUS CORRESPONDENCE, 1992 (14 pages)


2.2 Personal correspondence (146-191)

146. CORRESPONDENCE WITH F. SCHLESINGER, 1922-1941 (175 pages)
Harvard - Columbia

147. CORRESPONDENCE WITH W. DE SITTER, 1922-1934 (164 pages)

148. CORRESPONDENCE WITH H. SHAPLEY, 1923-1934 (140 pages)
H. Swope - Harvard

149. CORRESPONDENCE WITH P.J. VAN RHIJN, 1924-1957 (396 pages)
Mt. Stromlo - Columbia

150. CORRESPONDENCE WITH J. SCHILT, 1925-1960 (248 pages)
Mt. Stromlo - Columbia

151. CORRESPONDENCE WITH B.J. BOK, 1927-1972 (69 pages)
Harvard - Boyden station - World War II- Mt. Stromlo

152. CORRESPONDENCE WITH J.S. PLASKETT, 1927-1930 (15 pages)

153. CORRESPONDENCE WITH O. STRUVE, 1928-1963 (182 pages)
IAU - Yerkes - Berkeley - NRAO - McDonald Observatory

154. CORRESPONDENCE WITH H.T. STETSON, 1932-1934 (63 pages)
Perkins Observatory

155. CORRESPONDENCE WITH G.P. KUIPER, 1933-1970 (678 pages)
Lick - Yerkes - Lunar and Planetary Laboratory - Chile - Hawaii

156. CORRESPONDENCE WITH P.TH. OOSTERHOFF, 1933-1968 (200 pages)
World War II - Hartebeespoortdam - ESO site testing

157. CORRESPONDENCE WITH W. BAADE, 1940-1960 (397 pages)
Crab Nebula - I.S. Bowen - Mt. Wilson Observatory - Supernovae - Cepheids - Comets - Palomar Observatory - Globular clusters - 21-cm hydrogen line - ESO

158. VARIOUS CORRESPONDENCE DURING SECOND WORLD WAR, 1940-1945 (273 pages)

159. CORRESPONDENCE WITH B. LINDBLAD, 1941-1963 (92 pages)
Stockholm - Spiral arms - ESO

160. CORRESPONDENCE WITH J.J. RAIMOND, 1941-1961 (133 pages)
Hemel en Dampkring

161. CORRESPONDENCE WITH A. BLAAUW, 1942-1972 (373 pages)
Kenya - Yerkes - Groningen - ESO

162. CORRESPONDENCE WITH M. MINNAERT, 1942-1970 (414 pages)
World War II - ESO - Crab Nebula

163. CORRESPONDENCE WITH L. PLAUT, 1944-1945 (15 pages)
World War II

164. CORRESPONDENCE WITH A. DANJON, 1946-1964 (214 pages)
ESO - Paris - Leningrad - Egypt

165. CORRESPONDENCE WITH H. ZANSTRA, 1948-1962 (69 pages)

166. CORRESPONDENCE WITH M. SCHMIDT, 1950-1974 (143 pages)
Kenya - CalTech

167. CORRESPONDENCE WITH B. STRÖMGREN, 1952-1970 (108 pages)
Yerkes - Copenhagen

168. CORRESPONDENCE WITH P. SWINGS, 1953-1970 (98 pages)
Liège - ESO - BCAP - Comets

169. CORRESPONDENCE WITH G. VAN HERK, 1954-1970 (132 pages)
Naval Observatory - Mt. Wilson Observatory

170. CORRESPONDENCE WITH A.D. THACKERAY, 1954-1959 (10 pages)
IAU - Radcliffe telescope

171. CORRESPONDENCE WITH O. HECKMANN, 1957-1961 (100 pages)
ESO

172. CORRESPONDENCE WITH D. BROUWER, 1959-1964 (13 pages)

173. CORRESPONDENCE WITH E. HERTZSPRUNG, 1959-1960 (7 pages)

174. CORRESPONDENCE WITH J.L. PAWSEY, 1959-1961 (22 pages)

175. CORRESPONDENCE WITH G. WESTERHOUT, 1959-1970 (112 pages)

176. CORRESPONDENCE WITH W.N. CHRISTIANSEN, 1960-1974 (70 pages)
BCAP - Fleurs

177. CORRESPONDENCE WITH L. WOLTJER, 1960-1973 (70 pages)

178. CORRESPONDENCE WITH H.C. VAN DE HULST,1962-1969 (25 pages)

179. CORRESPONDENCE WITH C. DE JAGER, 1962-1969 (47 pages)

180. CORRESPONDENCE WITH K.K. KWEE, 1962 (14 pages)

181. CORRESPONDENCE WITH H. VAN WOERDEN, 1962-1969 (92 pages)

182. CORRESPONDENCE WITH G.W. ROUGOOR, 1964-1967 (92 pages)

183. CORRESPONDENCE WITH E. RAIMOND, 1965-1970 (141 pages)

184. CORRESPONDENCE WITH J.H. BANNIER, 1967-1968 (14 pages)

185. CORRESPONDENCE WITH J.K. MERKELIJN, 1969 (18 pages)

186. CORRESPONDENCE WITH W.W. SHANE, 1969-1972 (28 pages)

187. LETTERS WRITTEN ON THE OCCASION OF OORT'S 70TH BIRTHDAY AND RETIREMENT, 1970 (11 pages)

188. CORRESPONDENCE WITH P.C. VAN DER KRUIT, 1972-1975 (108 pages)

189. LETTERS WRITTEN ON THE OCCASION OF OORT'S 80TH BIRTHDAY, 1980 (48 pages)

190. LETTERS WRITTEN ON THE OCCASION OF OORT'S 90TH BIRTHDAY, 1990 (28 pages)

191. LETTERS OF CONDOLENCE, OBITUARIES, 1992 (177 pages)

2.3. Strange letters and wild theories (192)

192. STRANGE LETTERS AND WILD THEORIES, 1947-1966 (3 pages)

2.4. Correspondence with foreign visitors (193)

193. CORRESPONDENCE ON ARRANGEMENTS FOR FOREIGN VISITORS ON LONG-TERM VISITS (SABBATICALS, GUEST PROFESSORSHIPS, FELLOWSHIPS, STUDENTSHIPS ETC.), 1962-1969 (213 pages)

2.5. Correspondence on travel arrengements (194)

194. CORRESPONDENCE ON TRAVEL ARRANGEMENTS, 1950 (3 pages)

2.6. Correspondence on projects financed by ZWO (195-196)

195. CORRESPONDENCE WITH ZWO ON PROJECT FOR CALCULATING STELLAR ORBITS WITH A COMPUTER, 1956-1963 (21 pages)
A. Ollongren - Stellar orbits - ZWO

196. CORRESPONDENCE ON FUNDING OF ASTEROID PROGRAMME (48 pages)
Asteroids - I. van Houten-Groeneveld - ZWO

2.7. Letters of recommendation (197)

197. LETTERS OF RECOMMENDATION, 1975-1985 (35 pages)

3. Leiden Observatory

3.1 Correspondence on the Observatory at Hartebeespoortdam (198-210)
3.2. Correspondence Rockefeller Telescope (213)
3.3. Leids Sterrewacht Fonds (212)
3.4. Leids Kerkhoven-Bosscha Fonds (LKBF)(213)
3.5. Assistant Director (214-219)
3.6. Director (220-227)
3.7. Kenya Expedition (228-231)
3.8. Bosscha Observatory at Lembang (232-233)
3.9. Diaries; day-to-day appointments 234)
3.10. Jan Hendrik Oortfonds (235-236)

3.1 Correspondence on the Observatory at Hartebeespoortdam (198-210)

198. CORRESPONDENCE WITH TH. WALRAVEN AND OTHER MATTERS, 1950-1973 (841 pages)
Hartebeespoortdam - Light Collector - Mt. Stromlo
There are limitations to the consultation of this file;
written permission from the Librarian of Leiden University is required.


199. CORRESPONDENCE WITH H. VAN GENT AND W.CHR. MARTIN, 1935-1947 (156 pages)
Johannesburg

200. CORRESPONDENCE WITH W. VAN DEN BOS, 1941-1963 (84 pages)
Hartebeespoortdam

201. CORRESPONDENCE WITH A.J. WESSELINK, 1946-1964 (134 pages)
Johannesburg

202. CORRESPONDENCE WITH J. VAN DEN BERG,1951-1962 (125 pages)
South Africa - W. van den Bos - Hartebeespoortdam - ESO

203. CORRESPONDENCE WITH A.B. MULLER, 1953-1959 (125 pages)
Hartebeespoortdam

204. INFORMATION ON INAUGURATION OF HARTEBEESPOORTDAM, 1957 (84 pages)

205. RESIGNATION OF WALRAVEN AND SUCCESSION BY STATION MANAGER, 1962-1963 (128 pages)
South Africa - Hartebeespoortdam

206. CORRESPONDENCE WITH CSIR, 1962-1963 (21 pages)
E.J. Marais - S.M. Naudé - South Africa - IAU

207. CORRESPONDENCE WITH R.H. STOY, 1962-1963 (17 pages)
Hartebeespoortdam

208. CORRESPONDENCE WITH J. TINBERGEN, 1962-1970 (52 pages)
South Africa - Hartebeespoortdam - Th. Walraven

209. CORRESPONDENCE WITH J.A. GRAHAM, 1963-1964 (39 pages)
South Africa

210. CORRESPONDENCE WITH C. AND I. VAN HOUTEN, 1965-1969 (112 pages)
South Africa - Hartebeespoortdam - D.L. Stevenson - Light Collector

3.2. Correspondence Rockefeller Telescope (211)

211. CORRESPONDENCE ROCKEFELLER GRANT, 1927-1930 (58 pages)
Rockefeller telescope - W. de Sitter

3.3. Leids Sterrewacht Fonds (212)

212. FINANCES OF THE LEIDS STERREWACHT FONDS (THE LEIDEN OBSERVATORY FUND), 1930-1963 (227 pages)
LSF - Rockefeller grant - South Africa

(18 pages)
3.4. Leids Kerkhoven-Bosscha Fonds (LKBF) (213)

213. DOCUMENTS CONCERNING THE LEIDS KERKHOVEN-BOSSCHA FONDS, 1959-1962 (7 pages)
LKBF

3.5. Assistant Director (214-219)

214. SUCCESSION DE SITTER; OORT AS ASSISTANT DIRECTOR, 1935 (145 pages)
W. de Sitter - E. Hertzsprung

215. E. HERTZSPRUNG, 1936-1946 (18 pages)
Bruce Medal

216. OFFICIAL LEIDEN OBSERVATORY CORRESPONDENCE, 1937 (5 pages)
E. Hertzsprung - Assistant Director

217. ACTING DIRECTOR, 1937 (3 pages)

218. CORRESPONDENCE CONCERNING NEW INSTRUMENTATION AND FUNDING. 1937-1940 (19 pages)
Photometer - Schmidt camera - LSF - South Africa

219. ACTING DIRECTOR IN HERTZSPRUNG'S ABSENCE, 1938-1939 (1 page)

3.6. Director (220-227)

220. NOTES CONCERNING ORGANIZATION OF THE OBSERVATORY AND PERSONNEL MANAGEMENT,1945-1954 (76 pages)

221. THE ORGANISATION OF RESEARCH AT LEIDEN OBSERVATORY, 1945-1946 (36 pages)

222. CORRESPONDENCE WITH FACULTY ON FUNDING, ETC., 1952 (10 pages)

223. DOCUMENTS ON THE FUNDING OF OBSERVATORY INSTRUMENTS, BUILDINGS, ETC., 1955-1958 (10 pages)

224. STAFF MEETINGS, 1956-1970 (23 pages)

225. CORRESPONDENCE CONCERNING BUILDINGS UNDER THE RESPONSIBILITY OF THE DIRECTOR OF THE OBSERVATORY, 1959-1964 (5 pages)

226. ANNUAL REPORTS, 1966-1980 (8 pages)

227. OBSERVATORY COUNCIL, 1976-1981 (16 pages)
Rockefeller telescope

3.7. Kenya Expedition (228-231)

Transcripts by Arnold Schalks

228. CORRESPONDENCE DURING THE FIRST KENYA EXPEDITION, MOSTLY BETWEEN C.H. HINS AND W. DE SITTER, 1931-1933 (317 pages)
Kenya - G. van Herk

229. DOCUMENTS RELATING TO SECOND KENYA EXPEDITION, 1946-1951 (66 pages)
G. van Herk - Kenya - W.N. van Zadelhoff

230. CORRESPONDENCE WITH G. VAN HERK, 2ND KENYA EXPEDITION, 1947-1951 (42 pages)
Kenya - W.H. van Zadelhoff

231. CORRESPONDENCE WITH W.H. VAN ZADELHOFF, 1948-1950 (20 pages)
Kenya

3.8. Bosscha Observatory at Lembang (232-233)

232. CORRESPONDENCE WITH C.H. HINS, 1942-1950 (162 pages)
Lembang - E.A. Kreiken

233. CORRESPONDENCE WITH G.B. VAN ALBADA, 1944-1973 (363 pages)
E. van Dien - Lembang - Santoso Nitisastro - H. de Sitter-Zoetelief Tromp - LKBF

3.9. Diaries; day-to-day appointments (234)

234. DIARIES AND APPOINTMENTS, 1959-1991 (59 pages)

3.10. Jan Hendrik Oortfonds (235-236)

235. LIBER AMICORUM ON OORT'S 80-TH BIRTHDAY, 1980 (45 pages)

236. JAN HENDRIK OORTFONDS, 1985-1988 (4 pages)

4. Leiden University

4.1. Baccalaureate Committee (237)
4.2. Committee for the Development of Scientific Research (238)
4.3. Boerhaave Museum for the History of Science (239)
4.4. Academic Arts Committee (240)
4.5. Curatoren (241)
4.6. Senate (242-244)
4.7. Faculty of Science (245-248)
4.8. Bachiene Foundation (249)
4.9. Civitas Academica (250)

4.1. Baccalaureate Committee (237)

237. OORT'S DOCUMENTS FROM THE SENATE COMMfITEE TO INVESTIGATE TIlE FEASIBILITY OF A BACHELOR'S COURSE (BACCALAUREATE) AT LEIDEN UNIVERSITY, 1957-1959 (2 pages)

4.2. Committee for the Development of Scientific Research (238)

238. PROCEEDINGS OF THE COMMITTEE FOR THE DEVELOPMENT OF SCIENTIFIC RESEARCH, 1957-1959 (70 pages)

4.3. Boerhaave Museum for the History of Science (239)

239. CORRESPONDENCE CONCERNING THE STATE MUSEUM FOR THE HISTORY OF NATURAL SCIENCE (MUSEUM BOERHAAVE) AT LEIDEN, 1966-1969 (2 pages)

4.4. Academic Arts Committee (240)

240. MEMBERSHIP OF THE BOARD OF THE LEIDEN ACADEMIC ARTS CENTRE (LAK), 1946-1951 (178 pages)
LAK - Raedeker

4.5. Curatoren (241)

241. CORRESPONDENCE WITH CURATORS ON OBSERVATORY MATTERS, 1959-1960 (12 pages)

4.6. Senate (242-244)

242. THE SENATE OF LEIDEN UNIVERSITY, 1953-1969 (5 pages)

243. OORT'S MEMBERSHIP OF THE PRAESIDIUM SENATUS, 1957-1959 (5 pages)
Senate

244. DOCUMENTS OF THE COMMITTEE FOR THE GREAT AUDITORIUM, 1961 (7 pages)

4.7. Faculty of Science (245-248)

245. FACULTY COUNCIL (FACULTEITSBESTUUR), 1964-1966 (4 pages)

246. OORT'S TERM AS DEAN OF THE FACULTY OF SCIENCE, 1955 (11 pages)

247. LETTER OF THE DEANS OF THE SCIENCE FACULTIES TO THE PRIME MINISTER, WITH DRAFTS AND REACTIONS, 1956-1957 (58 pages)

248. FACULTY OF SCIENCE, 1963-1966 (30 pages)

4.8. Bachiene Foundation (249)

249. CORRESPONDENCE WITH THE BACHIENE FOUNDATION ON ANNUAL GRANTS FOR LEIDEN OBSERVATORY, 1924-1958 (68 pages)
W. de Sitter - E. Hertzsprung

4.9. Civitas Academica (250)

250. THE CIVITAS ACADEMICA AND RELATED MATTERS, 1940-1950 (48 pages)

5. Astronomy in the Netherlands

5.1. Netherlands Foundation for Radio Astronomy (251-263)
5.2. Benelux Cross Antenna Project (264-270)
5.3. Space Research (271-277)
5.4. Bulletin of the Astronomical Institutes of the Netherlands (278)
5.5. Eclipse Commission (279)
5.6. Summer course at Nijenrode (280)
5.7. Scientific meetings (281-283)
5.8. Dutch Telescope in Southern Europe (284)
5.9. Academic Council, section Astronomy (SSAR) (285)

5.1. Netherlands Foundation for Radio Astronomy (251-263)

251. EARLY CORRESPONDENCE ON RADIO TELESCOPES, 1944-1948 (34 pages)
G. Reber - C.l. Bakker - Th.N. Theunissen

252. CORRESPONDENCE SRZM-ZWO ON DWINGELOO, 1959-1962 (1 page)

253. ANNUAL REPORTS TO ZWO, 1962-1971 (9 pages)

254. EARLY 21-CM HYDROGEN LINE OBSERVATIONS AND THE DWINGELOO TELESCOPE, 1956-1981 (23 pages)

255. COOPERATION BETWEEN PTT AND SOLAR RESEARCH WORKING GROUP, 1960- 1963 (5 pages)
Kootwijk

256. ORGANIZATION OF SCIENTIFIC PROGRAMMES USING DWINGELOO, 1962-1966 (25 pages)
Brightness temperature - Programming of observations

257. POSSIBLE WSRT PROGRAMMES, 1966-1970 (49 pages)
Galaxies - 21-cm hydrogen line - CO lines

258. DWINGELOO PROGRAMMES, 1968-1973 (25 pages)

259. WESTERBORK 21-CM LINE PROPOSALS, 1970-1973 (17 pages)

260. FOREIGN ADVISERS OF THE FOUNDATION FOR RADIO ASTRONOMY, 1971-1974 (14 pages)
SRZM

261. WESTERBORK PROGRAMMES, 1977-1980 (28 pages)
WSRT

262. HI AT HIGH REDSHIFTS, 1987 (4 pages)

263. BOARD MEETINGS, 1948-1968 (8 pages)
SRZM

5.2. Benelux Cross Antenna Project (264-270)

264. FUNDING OF PRELIMINARY STUDIES, OECD "MEETING OF EXPERTS" IN DECEMBER 1961, SITE SELECTION FOR BCAP, DEVELOPMENT STUDY OF PARAMPS BY MBLE, INAUGURATION OF WESTERBORK SYNTHESIS RADIO TELESCOPE, 1958-1970. (168 pages)
A. Delsemme - WSRT

265. CORRESPONDENCE ON APPOINTMENTS, RESIGNATIONS ETC. OF THE BCAP, 1959- 1968 (6 pages)

266. DOCUMENTS ON ORIGINAL DESIGN AND LATER CHANGES. PROCEEDINGS OF BCAP COUNCIL, 1960-1965 (13 pages)

267. CORRESPONDENCE AND DOCUMENTS RELATING TO BELGIAN PARTICIPATION IN BCAP, 1960-1968 (1 page)
Belgium - R. Coutrez

268. CORRESPONDENCE WITH N.V.G. SARMA, 1960-1962 (16 pages)

269. CORRESPONDENCE WITH CH.L. SEEGER, 1960-1962 (13 pages)

270. CORRESPONDENCE WITH TH. BENNEBROEK, 1962-1966 (29 pages)

5.3. Space Research (271-277)

271. PRELIMINARY STAGES OF GROC, FOUNDATION OF ELDO, 1959-1961 (46 pages)

272. DOCUMENTS RELATING TO TIlE ADVISORY COMMITTEE FOR GROC. CORRESPONDENCE ON COPENHAGEN MEETING, 1962-1970 (59 pages)
Cosmic Ray Working Group

273. GENERAL DOCUMENTS RELATING TO GROC AND TO THE ELECTRON COMPONENT OF COSMIC RAYS, 1965-1969 (7 pages)

274. BLUE STREAK PROJECT, 1961 (10 pages)
ELDO

275. LETTERS AND DOCUMENTS ON PROJECT WESTFORD, 1961-1963 (61 pages)
COSPAR

276. EUROPEAN SPACE RESEARCH ORGANIZATION, 1965-1966 (2 pages)
ESRO

277. INFRARED ASTRONOMY AND IRAS, 1973-1975 (3 pages)
IRAS

5.4. Bulletin of the Astronomical Institutes of the Netherlands (278)

278. CORRESPONDENCE ON THE PUBLICATION OF ARTICLES FROM LEIDEN OBSERVATORY, 1953-1966 (2 pages)
BAN - Leiden Annals

5.5. Eclipse Commission (279)

279. CORRESPONDENCE AND REPORTS CONCERNING ECLIPSE COMMITTEES, 1950-1966 (2 pages)
J. Houtgast - J. Heintze

5.6. Summer course at Nijenrode (280)

280. SUMMER COURSE AT NIJENRODE ON STRUCTURE AND EVOLUTION OF THE GALACTIC SYSTEM, 1959-1960 (49 pages)
W. Baade

5.7. Scientific meetings (281-283)

281. ANNOUNCEMENTS AND PROGRAMMES OF DUTCH ASTRONOMERS' CONFERENCES, 1949-1968 (103 pages)

282. PROGRAMMES OF MEETINGS OF NAC, 1959-1987 (29 pages)

283. SCIENTIFIC MEETINGS AND WORKSHOPS, 1977-1982 (11 pages)

5.8. Dutch Telescope in Southern Europe (284)

284. DOCUMENTS RELATED TO THE FOUNDATION OF A DUTCH OBSERVING STATION IN SOUTHERN EUROPE, 1963-1968 (75 pages)

5.9. Academic Council, section Astronomy (SSAR) (285)

285. SSAR AND ITS PREDECESSOR, THE DUTCH ASTRONOMY COUNCIL, 1959-1966 (28 pages)

6. Netherlands

6.1. KNAW (Royal Dutch Academy of Sciences) (286-287)
6.2. Other learned societies and organizations, both national and foreign (288)
6.3. Speeches (289)
6.4. Teacher's degree examinations (290)
6.5. Academic Council (291)
6.6. KNMI (Royal Dutch Meteorological Institute) (292)
6.7. Editorial Board of Natuur en Techniek (293)
6.8. Christiaan Huygens (294)

6.1. KNAW (Royal Dutch Academy of Sciences) (286-287)

286. CORRESPONDENCE WITH THE ROYAL DUTCH ACADEMY OF SCIENCES (KNAW) , 1950-1955 AND 1963-1966 (40 pages)

287. DOCUMENTS CONCERNING THE SECTION FOR PHYSICS OF THE KNAW, 1963-1967 (41 pages)
Laboratory Astrophysics

6.2. Other learned societies and organizations, both national and foreign (288)

288. VARIOUS SOCIETIES, DUTCH AND FOREIGN, 1956-1970 (40 pages)
Bataafs Genootschap - Hollandse Maatschappij van Wetenschappen - Maatschappij voor Nederlandse Letterkunde - NVWS - Royal Society

6.3. Speeches (289)

289. SPEECHES, 1955-1970 (20 pages)

6.4. Teacher's degree examinations (290)

290. TEACHER'S DEGREE EXAMINATIONS, 1930-1941 (12 pages)

6.5. Academic Council (291)

291. DOCUMENTS RELATING TO THE COMMITTEE FOR THE PHYSICAL SCIENCES OF THE ACADEMISCHE RAAD (ACADEMIC COUNCIL), 1962-1964 (53 pages)

6.6. KNMI (Royal Dutch Meteorological Institute) (292)

292. CORRESPONDENCE RELATING TO CURATOREN OF THE KNMI, 1959-1968 (13 pages)
Geodesy committee - Antarctic Commission - W. Bleeker

6.7. Editorial Board of Natuur en Techniek (293)

293. EDITORIAL BOARD OF NATUUR AND TECHNIEK, 1972-1983 (5 pages)

6.8. Christiaan Huygens (294)

294. CHRISTIAAN HUYGENS, 1978-1979 (18 pages)

7. Europe

7.1. European Southern Observatory (295-297)
7.2. Astronomy and Astrophysics (298)
7.3. Astronomy and Astrophysics, correspondence and referee reports (299)
7.4. European Conferences (300)
7.5. Foreign Programme committees (301-302)
7.6. Astronomy in Germany (303)
7.7. Pontifical Academy (304-305)
7.8. Jury membership Prix Docteur A. de Leeuw (306)

7.1. European Southern Observatory (295-297)

295. MISCELLANEOUS CORRESPONDENCE CONCERNING ESO, 1953-1963 (115 pages)
ESO site testing- Participation UK

296. CORRESPONDENCE CONCERNING ESO, 1974-1988 (51 pages)

297. INAUGURATION ESO HEADQUARTERS, 1981 (13 pages)

7.2. Astronomy and Astrophysics (298)

298. FOUNDATION OF ASTRONOMY & ASTROPHYSICS: CONTRACTS, COSTS, EDITORIAL POLICY, BOARD OF DIRECTORS, 1968-1972 (124 pages)
A&A - A&A Supplements - ESO - J.L. Steinberg - S.R. Pottasch

7.3. Astronomy and Astrophysics, correspondence and referee reports (299)

299. ARTICLES SENT FOR REFEREEING AND FURTHER CORRESPONDENCE, 1969-1979 (5 pages)
A&A

7.3. European Conferences (300)

300. SOLVAY CONFERENCE AND GELEHRTENWOCHE MÜNCHEN, 1964 (10 pages)

7.4. Foreign Programme committees (301-302)

301. VISITING COMMITTEE OF THE NANÇAY RADIO TELESCOPE, 1971-1977 (12 pages)

302. VISITING COMMITTEE (FACHBEIRAT) OF BONN RADIO OBSERVATORY, 1973-1975 (8 pages)

7.5. Astronomy in Germany (303)

303. WORKING GROUP ON THE DEVELOPMENT OF ASTRONOMY IN GERMANY, 1967 (23 pages)

7.6. Pontifical Academy (304-305)

304. PONTIFICAL ACADEMY, 1961-1976 (136 pages)

305. PONTIFICAL ACADEMY, 1977-1990 (74 pages)

7.7. Jury membership Prix Docteur A. de Leeuw (306)

306. MEMBERSHIP JURY PRIX DOCTEUR A. DE LEEUW, 1985 (25 pages)

8. International

8.1. International Astronomical Union (IAU) (307-311)
8.2. Inter-Union Committee for the Allocation of Frequencies (IUCAF) (312)
8.3. International Council of Scientific Unions (ICSU) (313)
8.4. Symposia (314-322)
8.5. Foreign Visits, lectures, and seminars (323-332)
8.6. Honours and prizes (333-335)
8.7. International Computation Centre (336)
8.8. Copernicus 500th Anniversary celebrations (337)
8.9. Periodical publications (338-339)
8.10. Humanitarian Issues (340)

8.1. International Astronomical Union (IAU) (307-311)

307. GENERAL ASSEMBLY OF THE IAU IN LENINGRAD, 1950-1951 (43 pages)

308. GENERAL ASSEMBLY OF THE IAU IN DUBLIN, 1955 (13 pages)

309. OORT'S PRESIDENCY OF THE IAU AND SUBSEQUENT ADVISORSHIP OF THE EXECUTIVE COMMITTEE, 1958-1964 (37 pages)
D.B. Sadler - Berkeley - Hamburg - ICSU - China - Project Westford

310. VARIOUS MATTERS CONCERNING THE IAU, 1964-1976 (5 pages)
IAU

311. MISCELLANEOUS CORRESPONDENCE CONCERNING THE IAU, 1968-1988 (8 pages)
IAU

8.2. Inter-Union Committee for the Allocation of Frequencies (IUCAF) (312)

312. THE INTER-UNION COMMITTEE ON THE ALLOCATION OF FREQUENCIES, 1960-1969 (18 pages)
IUCAF - RL Smirh-Rose - ICSU - Project Westford

8.3. International Council of Scientific Unions (ICSU) (313)

313. CORRESPONDENCE RELATING TO ICSU, 1959-1963 (3 pages)
ICSU - IAU

8.4. Symposia (314-322)

314. SYMPOSIA AND OTHER MEETINGS, 1953-1961 (151 pages)
Stellar dynamics - Radio astronomy - Astrometry - Cosmic rays

315. SYMPOSIA AND OTHER MEETINGS, 1962-1975 (59 pages)
Stellar dynamics - Galactic structure - Galactic centre - Active galaxies - IR astronomy

316. SYMPOSIA AND OTHER MEETINGS, 1966-1968 (13 pages)
ESO - Laboratory Astrophysics

317. OORT'S 70TH BIRTHDAY SYMPOSIUM. 1970 (117 pages)
Radio sources - Cosmology

318. SYMPOSIA AND OTHER MEETINGS, 1970-1973 (121 pages)
Galactic structure - Nuclei of alaxies - Galactic dynamics - Evolution of glaxies

319. SYMPOSIA AND OTHER MEETINGS, 1974-1978 (67 pages)
Galactic centre - External galaxies - Active galaxies

320. NATO SUMMER SCHOOLS AND RESEARCH GRANTS, 1976-1987 (4 pages)

321. SYMPOSIA AND OTHER MEETINGS, 1978-1982 (43 pages)
Galactic dynamics - IR astronomy - Galactic centre - External galaxies

322. SYMPOSIA AND OTHER MEETINGS, 1983-1986 (72 pages)
Superclusters - IR astronomy - Formation of alaxies

8.5. Foreign Visits, lectures, and seminars (323-332)

323. FOREIGN VISITS, LECTURES AND SEMINARS, 1946-1952 (100 pages)
Princeton - CalTech - South Africa - Tycho Brahe commemoration - Neptune

324. LECTURE NOTES FOR A COURSE OF LECTURES AT YERKES IN 1947 AND AT PRINCETON AND CALTECH IN 1952. (1 page)

325. JOURNEY TO EGYPT, 1950-1951 (44 pages)

326. NOTES ON DISCUSSIONS WITH W. BAADE DURING VISITS TO THE US AND LATER, 1952-1961 (45 pages)
W. Baade - Populations - Planetary nebulae - Globular clusters

327. FOREIGN TRAVEL, 1954-1968 (88 pages)
IR astronomy - Crab Nebula - Stellar dynamics - High-velocity clouds

328. NOTES MADE DURING SEVERAL VISITS TO PRINCETON AND OTHER PLACES (BRUSSELS, HAMBURG), 1958-1964 (20 pages)
M33 - J. Wolterbeek Muller - Proper motions

329. VISITS TO PRINCETON, 1961-1985 (136 pages)

330. FOREIGN VlSITS, 1968-1973 (113 pages)
Crab Nebula - Galaxies - High-velocity clouds

331. NOTES FOR SEMINARS, 1971-1977 (20 pages)
Radio galaxies - Radio sources

332. FOREIGN VISITS, 1975-1985 (52 pages)

8.6. Honours and prizes (333-335)

333. MEMBERSlllP OF ACADEMIES AND LEARNED SOCIETIES, HONOURS, AWARDS AND PRIZES, 1935-1989 (300 pages)

334. BALZAN PRIZE, 1984 (68 pages)

335. KYOTO PRIZE, 1987 (90 pages)

8.7. International Computation Centre (336)

336. DOCUMENTS CONCERNING AN INTERNATIONAL COMPUTATION CENTER, 1951 (21 pages)
IAU

8.8. Copernicus 500th Anniversary celebrations (337)

337. COPERNICUS 500TH ANNIVERSARY CELEBRATIONS, 1973 (64 pages)

8.9. Periodical publications (338-339)

338. CORRESPONDENCE ON ARTICLES FOR ANN. REV., 1964-1983 (94 pages)

339. ASTROPHYSICAL LETTERS. 1967-1981 (32 pages)

8.10. Humanitarian Issues (340)

430. CORRESPONDENCE ON HUMANITARIAN ISSUES, 1980-1990 (106 pages)

9. Personal archives
There are limitations to the consultation of these files;
written permission from the Librarian of Leiden University is required.


9.1. Correspondence (341-348)
9.2. Documents and notes (349-358)
9.3. Personal notes and diaries (359-361)
9.4. Press cuttings (362)

9.1. Correspondence (341-348)
There are limitations to the consultation of these files;
written permission from the Librarian of Leiden University is required.

341. LEITERS FROM 1.R. OORT TO HIS WIFE, 1.M. OORT-GRAADT VAN ROGGEN. MOSTLY WRITTEN FROM 1939 ONWARDS DURING OORT'S FOREIGN TRAVEL, 1939-1971 (310 pages)

342. LETTERS FROM J.M. OORT-GRAADT VAN ROGGEN TO J.H. OORT. FROM 1925 ONWARDS, MOSTLY DURING OORT'S FOREIGN TRAVEL, 1925-1963 (334 pages)

343. CORRESPONDENCE WITH A.H. OORT FAMILY (PARENTS OF J.H. OORT), 1917-1947 (120 pages)

344. CORRESPONDENCE WITH W. GRAADT VAN ROGGEN FAMILY (PARENTS OF MRS. OORT), 1927-1966 (217 pages)

345. LETTERS FROM/TO OORT'S CHILDREN, 1938-1963 (6 pages)

346. LETTERS FROM/TO BROTHERS, SISTERS, AND FURTHER RELATIVES, 1917-1991 (46 pages)

347. CORRESPONDENCE WITH MR. AND MRS. C. TORREY, 1923-1947 (71 pages)

348. MISCELLANEOUS CORRESPONDENCE, 1919-1981 (26 pages)

9.2. Documents and notes (349-358)
There are limitations to the consultation of these files;
written permission from the Librarian of Leiden University is required.

349. SCHOOL REPORTS, 1906-1917 (29 pages)

350. STORIES, TRANSLATIONS, ETC., 1910-191 (20 pages)

351. NOTES MADE IN THE USA, 1922-1924 (10 pages)

352. MILITARY SERVICE, 1922-1945 (8 pages)

353. FAMILY SPEECHES, 1927-1987 (32 pages)

354. MISCELLANEOUS FAMILY DOCUMENTS, 1927-1972 (23 pages)

355. MISCELLANEOUS NOTES, 1930-1939 (1 page)

356. DOCUMENfS AND NOTES ON 2ND WORLD WAR, 1940-1945 (82 pages)

357. DEATH OF A.H. OORT, 1941 (22 pages)

358. HOLIDAY COTTAGE AT HAAMSTEDE, 1960-1971 (27 pages)

9.3. Personal notes and diaries (359-361)
There are limitations to the consultation of these files;
written permission from the Librarian of Leiden University is required.

359. DIARIES, 1915-1960 (798 pages)

360. APPOINTMENT BOOKS WITH DIARY NOTES, 1923-1991 (958 pages)

361. MISCELLANEOUS NOTES, 1922-1987 (4 pages)

9.4 Press cuttings (362)
There are limitations to the consultation of these files;
written permission from the Librarian of Leiden University is required.

362. PRESS CUTTINGS CONCERNING OORT, 1930-1992 (210 pages)


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