Emmons, William Harvey <br/><br/>
The principles of economic geology 

 - 2nd ed. 
 - New York  McGraw - Hill book company, inc.  1940 
 - xix, 529p.  Illustration  23cm x 15cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geology<br/>Economic geology<br/>Ore deposits
<br/><br/><label>Dewey Class. No.: </label>553  / EMM