Dorr, John Van Nostrand <br/><br/>
Cyanidation and concentration of gold and silver ores /  
John V. N. Dorr... 
 - New York :   London :   McGraw-Hill Book Company, inc.,  1936. 
 - ix, 485p.  il.,  24cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>ORO--METALURGIA<br/>PLATA--METALURGIA
<br/><br/><label>Universal Decimal Class. No.: </label>669.21/.23