Struve, Otto  <br/><br/>
Astronomy of the 20th century 

 - New York:   The Macmillan Company,   1962 
 - 544p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy
<br/><br/><label>Universal Decimal Class. No.: </label>52"19"  / K2