Richards, Robert H. <br/><br/>
Ore Dressing / 
Robert H. Richards 
 - New York :  The Engineering and Mining Journal,  1903 
 - 643 p. ; 23 cm. 
<br/><br/> Incluye apéndice e índice 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Geociencia<br/>Industria mineral
<br/><br/><label>LC Class. No.: </label>TN 500 R524