Hubble, Edwin <br/><br/>
The realm of the nebulae 
Edwin Hubble 
 - New York  Dover Publications  1958 
 - xiv, 207p. 
<br/><br/><label>Subjects--Topical Terms: </label><br/> Nebulae <br/> Planetary nebulae<br/>Astronomy and astrophysics thesaurus 
<br/><br/><label>Universal Decimal Class. No.: </label>524.5  / HUB