Emmons, William H.  1876- <br/><br/>
The enrichment of ore deposits / 
By William harvey emmons 
 - 530 páginas 
 - U.s. geological survey. bulletin ;  625 .
<br/><br/> A la cabeza de la portada: department of the interior 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Yacimientos minerales
<br/><br/><label>LC Class. No.: </label>TN263  / E55