The astronomical almanac for the year 2018 
Nautical Almanac Office, United States Naval Observatory     
 - Washington  U. S. Naval Observatory  2017 
 - [various pagings.] 
<br/><br/><label>ISBN: </label>978-0-7077-41772 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Almanac<br/>Astronomical almanac<br/>Ephemaris
<br/><br/><label>Universal Decimal Class. No.: </label>(059):52  / NAU