Blaauw, Adriaan. Archives of the International Astronomical Union : Union Astronomique internationale : inventory for the years 1919-1970 / by A. Blaauw.

Blaauw, Adriaan.

Archives of the International Astronomical Union : Union Astronomique internationale : inventory for the years 1919-1970 / by A. Blaauw.

International Astronomical Union -- Archives -- Catalogs.

International Astronomical Union -- History -- Sources -- Catalogs.

Astronomy -- History -- Sources -- Catalogs.

International Astronomical Union