Dorr, John Van Nostrand  1872-, <br/><br/>
Cyanidation and concentration of gold and silver ores / 
By John v. n. dorr 
 - 485 páginas 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Endurecimiento superficial<br/>Oro--Metalurgia<br/>Plata--Metalurgia
<br/><br/><label>LC Class. No.: </label>TN767  / D67