Hubble, Edwin <br/><br/>
The Realm of the Nebule 

 - London:  Oxford University Press  1936 
 - 210p. :   il; 23 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astrofísica y Astronomía Descriptiva<br/>Material interestelar<br/>interstellar matter