The American ephemeris and Nautical Almanac for the year 1969 - United States. Naval Observatory. Nautical Almanac Office; United States. Navy Department. Bureau of Navigation; United States. Navy Department. Bureau of Equipment (Washington : Nautical Almanac Office, 1967)
Issued: 1917-1986 by Nautical Almanac Office, U.S. Naval Observatory.
Keywords: Astronomy -- Observations