Correspondence with the Nautical Almanac Office and related papers, including the following material:

(1) General correspondence

Correspondence with D.H. Sadler regarding the prices of N.A.O. publications, 1948.

Correspondence between R. Atkinson and Professor Sollenberger regarding latitude changes, 1947.

Memorandum of discussions and decisions involving Dr G.M. Clemence of the American N.A.O. and D.H. Sadler of the British N.A.O., 1947.

Correspondence with D.H. Sadler, including a short memorandum on 'Copyright in the Nautical Almanac', 1947.

Correspondence with H. Spencer Jones regarding the employment of H.G. Scott Barrett at the Royal Observatory, 1941.

Reference sheet sent from the N.A.O. to the Astronomer Royal regarding the destruction of
N.A.O. publications by enemy action, 1940.

Correspondence with the Hydrographer regarding the damage done by incendiary bombs to Messrs J.G. Hammond and Co., printers of various publications for N.A.O., 1940.

Correspondence on publications lost due to fire, 1940.

Correspondence with D.H. Sadler, 1940, regarding a request from Professor Schorr for copies of the 'Nautical Almanac' for 1941.

List of the 'Distribution of the Nautical Almanac to Enemy of Occupied Countries', 1940.

Correspondence with J.F. Hellweg, Washington, regarding data for the satellites of Saturn, Uranus and Neptune, 1938.

List of firms or individuals that reproduce materials from the 'Nautical Almanac', with remarks on the same, 1938.

Correspondence between the Astronomer Royal and the Hydrographer regarding 'civil', 'nautical' and 'astronomical' twilight, 1937.

(2) Air Almanac

Correspondence between D.H. Sadler and H. Spencer Jones regarding a new navigational instrument known as Astrograph Mark I, 1940.

Correspondence with D.H. Sadler regarding the publication of the 'Air Almanac' in the United States, 1939.

Correspondence between D.H. Sadler and Wing Commander P.H. Mackworth regarding the publication of the 'Air Almanac' and astronomical navigation tables, 1938.

Correspondence between D.H. Sadler and H. Spencer Jones regarding the altitude-azimuth tables and cooperation with the United States, 1938.

Correspondence with H. Spencer Jones regarding new proposals for the 'Air Almanac', 1938.

Correspondence regarding the altitude-azimuth tables, with a summary of decisions made at the meeting of 8 November 1937.

Correspondence regarding the 'Air Almanac', with a draft explanation and illustrations, 1937.

Letter of approval from the Hydrographer to the Astronomer Royal regarding the preparation of an air almanac and altitude and azimuth tables for use in long distance flights, 1937.

Correspondence concerning the altitude-azimuth tables, with a N.A.O. programme relating to possible cooperation with the U.S. Hydrographic Department in the production of the tables, 1937.

Criticisms by the N.A.O. of the altitude-azimuth tables in H.O. 214, 1937.

Correspondence regarding the altitude-azimuth tables, with preliminary estimates from D.H. Sadler, 1937.