Papers regarding to the International Astronomical Union, including the following items:

Reports on meetings of the Executive Committee of the I.A.U. concerning the 10th General Assembly in Moscow, 1958.

Correspondence with R. Woolley and C. Jowsey regarding a visit to Washington by D.H. Sadler for a meeting of the Executive Committee of the International Council of Scientific Unions, September 1958.

Correspondence with the Academy of Sciences, U.S.S.R.; Professors Zverev, Oosterhoff and Redman; R. Atkinson; and P.G. Kulikovsky regarding the 10th General Assembly of the I.A.U. in Moscow, 1958, including lists of British delegates and members of Royal Greenwich Observatory staff attending, and material on travel arrangements, expenses, grants, passports and visas, meetings and commissions.

Correspondence with Professor Blaauw regarding the Stockholm conference on the coordination of galactic research, 1957.

Correspondence between R. Atkinson and D.H. Sadler concerning the value for the lunar semi-diameter, 1958.

Correspondence concerning the I.A.U. election of the Vice President and President, nominations for membership, and appointments to the Executive Committee, 1958.

Correspondence regarding the formation of the Committee on Contamination by Extra-terrestrial Exploration, 1958.

Circular on the Joint International Astronomical Union - Union Radio Scientifique Internationale symposium on radio astronomy, 1957.

Correspondence and reports on various commissions, including Commissions 8, 19, 25 and 32, 1957. The correspondents include Atkinson, Zverev, C.A. Murray, Dr Federov, Professor van Rhijn and Dr Stoy.

Correspondence between Mr Symms and Mr Scott concerning observations and reductions of AGK3R Stars, 1957-1958.

Correspondence between R. Woolley and P. Couderc concerning Carte du Ciel Plates, 1957-1958.

Correspondence between H.M. Smith and Dr Markowitz regarding the General Assembly and variations in the rotation of the Earth, 1957-1958.

Correspondence with various people, include P.T. Oosterhoff, R. Woolley and Professor Blaauw concerning the Stockholm conference on galactic research, 1957-1958.

Memorandum on 'Magellanic Clouds' by A.D. Thackeray.

Printed statutes of the Foundation Internationale du Pic-du-Midi, 1956.

Papers relating to the International Astronomical Union symposium on electromagnetic phenomena in cosmic physics, 1956.

Correspondence between Van Miegham, P.T. Oosterhoff, Kuiper, Dr Kaplan and Dr Woolley regarding the measurement of the Earth's albedo, 1956.

Correspondence with the Fraunhöfer Institut regarding solar maps, 1956.

Correspondence with P.T. Oosterhoff and comments by D.H. Sadler and P.A. Wayman concerning solar work, 1956.

Correspondence between H. Spencer Jones, Professor van Rhijn and Paul Couderc concerning the proper motion of stars list, 1955.

Report to Professor Zverev on meridian work done at Greenwich, 1955.

Correspondence with Dr Markowitz and Dr Stokyo regarding Universal Time, 1955.

Correspondence with Dr Essen on the development of the Caesium Clock, 1955.

Correspondence with various people, including H. Spencer Jones, P.T. Oosterhoff, Dr Guth and O. Struve, concerning the 9th General Assembly of the I.A.U., Dublin, 1955, including R.G.O. attendance; other delegates, especially those from Czechoslovakia; travel arrangements; visas; commissions; and attendance at other meetings.

Correspondence concerning proposals for the reduction of the observations of the AGK3R Stars, 1955.

Lists of reference stars, tables and diagrams, 1955.

'The Time Service of the Soviet Union', a paper prepared by D. Shishkin, and correspondence with V.S. Safrono and N.N. Pavlov, 1954.

Correspondence and reports, 1954, regarding Time Services, frequencies and time signals, time and longitude determination, I.A.U. Commission 31 and Geophysical Year. The correspondents include the Steinberg Astronomical Institute; the U.S. Naval Observatory; Abinger Magnetic Observatory; the Tashkent Observatory; observatories in Paris, Bucharest, Belgrade, Hamburg, Cadiz, Neuchatel, Tokyo, Italy, Belgium, Brazil and Argentina; the Union Observatory, South Africa; and the Mount Stromlo Observatory.

Correspondence with Jules Baillaud concerning the Carte-du-Ciel photographs, 1954.

Printed booklet on the proposed draft of the 150 recommendation, 1954.

Booklet titled 'Quantities and Units of Space and Time', 1954, and correspondence with Dr Bjeige concerning solar and ephemeris time.

Report of the Committee on Magnetic Charts, 1954.

Correspondence with Professor Stratton concerning Commission 29, 1954.

Correspondence with A. Blaauw and the Admiralty concerning the I.A.U. conference on galactic research in Holland, June 1953.

Correspondence with M. Zveryov regarding meridian astronomy, 1953.