Skywatching / 
consultant editors, Robert Burnham, John O'Byrne. 
 - San Francisco, CA :  Fog City Press,  c2004. 
 - 608 p. :  col. ill., col. maps ;  19 cm. 
 - Encyclopedia of discovery. .
<br/><br/><label>ISBN: </label>1877019895 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy.<br/>Astronomy--Observers' manuals.<br/>Astronomy--History.
<br/><br/><label>Dewey Class. No.: </label>520