Dunlop, J.P. <br/><br/>
Metals and ores in 1914 and 1915. 

 - Washington, D.C.  Government Printing Office  1916 
 - pp. 723-733 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA