Emmons, William H.  1876- <br/><br/>
The enrichment of suplhide ores / 
By William harvey emmons 
 - 260 páginas 
 - E. u. geological survey. bulletin ;  529 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Sulfuros
<br/><br/><label>LC Class. No.: </label>TN263  / E57