"Gregersen, Erik (ed.)" <br/><br/>
Astronomical observations 

 - New York  Britannica Educational pub.  2010 
 - 214 p. 
<br/><br/><label>ISBN: </label>9781615300259 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy - Popular works
<br/><br/><label>Dewey Class. No.: </label>R 520 AST