The Astronomical Almanac for the year 1990 
U.S. Government Printing Office                              
 - Washington  U. S. Government Printing Office  1989 
 - [various pagings.] 
<br/><br/><label>ISBN: </label>0-11-88694-5 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Almanacs<br/>Astronomy and Astrophysics Thesaurus<br/>Ephemerides
<br/><br/><label>Universal Decimal Class. No.: </label>059:52  / AAL-90