Scientific american book <br/><br/>
Universe 

 -  1957 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>74903 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Astronomy
<br/><br/><label>Dewey Class. No.: </label>B9, J7  CL