Hubble, Edwin <br/><br/>
The realm of the nebule 

 - London  Yale university  1982 
 - xvii,207p. 
<br/><br/><label>ISBN: </label>0300025009   
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy
<br/><br/><label>Dewey Class. No.: </label>523.1  / HUB