Varnum, William B. <br/><br/>
Differential refraction in positional astronomy 
William B. Varnum 
 - New York  Carnegie Institution of Washington  1922 
 - 50p 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astrometry<br/>Astronomy and Astrophysics thesaurus<br/>Refraction
<br/><br/><label>Universal Decimal Class. No.: </label>521.9  / VAR