O'Meara, Stephen James, <br/><br/>
Deep-Sky Companions: The Caldwell Objects : 

 -  Cambridge University Press,  2002. 
 - 516 pages 
<br/><br/><label>ISBN: </label>9780521827966 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Nature.
<br/><br/><label>Dewey Class. No.: </label>522  / OME