Dunlop, J.P. <br/><br/>
Gold and Silver in 1918 :   (General Report). 

 - Washington, D.C.  Government Printing Office  1920 
 - pp. 727-781 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA