Correspondence and papers regarding the International Astronomical Union's Solar Parallax Sub-commission, including the following items:

Correspondence concerning the sale of a 8-inch Cooke Refractor to the Astronomical Society of South Africa, 1948.

Correspondence concerning the correction of longitude of Allegheny Observatory, United States, 1940.

Correspondence concerning missing plates of the Eros observations from Lembang, Java, 1940.

Correspondence with various observatories concerning the measurement and reductions of Eros plates and the collation of data by H. Spencer Jones, with samples and lists of tables, 1937-1940. The observatories are the Radcliffe; Cambridge; Bergedorf; Leipzig; Bordeaux; U.C.C.L.E.; Algiers; Catania; San Fernando; Prague; Pulkovo; Allegheny; Dearborn; Leander and McCormick; Lick; Swaithmore; Yerkes; Washington; Van Vleck; Zo-Se; Tokyo; Lembang; Hyderabad; Cape; Yale; Harvard; Union Observatory, Johannesburg; Melbourne; Cordoba; La Plata; Berlin-Babebsberg; Heidelberg; Vienna; Bescançon; Arcetri, Italy; Padova; Teramo; Milan; Lisbon; Kwasan; and Tacubaya, Mexico.

Report of Commission 20 by A.O. Leuschner, 1938.

Report of the Sub-commission on Solar Parallax by H. Spencer Jones, 1938.

Correspondence with Professor R. Schorr concerning corrections to the Bergedorf catalogue, 1938.

Correspondence with J.H. Oort concerning a special grant for Eros work, 1938.