Scientific American resource library 
by  
 -  1969 
 - p.  cm. 
<br/><br/><label>Standard No.: </label>73713 
<br/><br/><label>Source: </label> Textual 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology
<br/><br/><label>Dewey Class. No.: </label>Hz7, K9.2   CS