The American ephemeris and Nautical Almanac for the year 1969 / 
United States Naval Observatory, Nautical Almanac Office 
 - Washington :  Nautical Almanac Office,  1967 
 - xviii, 526 p. :  ill. ;  25 cm. 
<br/><br/>Issued: 1917-1986 by Nautical Almanac Office, U.S. Naval Observatory. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy--Observations
<br/><br/><label>Dewey Class. No.: </label>520.8