Office ,  Nautical Almanac. <br/><br/>
The Astronomical Almanac For the Year 1981 / 
Nautical Almanac Office. 
 - Washington, D.C. :  Government Printing Office,   1980. 
 - various pagings : illustrations, charts, tables ;   25 cm 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Dewey Class. No.: </label>528  / AST