Butler, B.S.. <br/><br/>
Silver, Cooper, Lead, and Zinc in the central States in 1913 :   Mines Report. 

 - Washington, D.C.  Government Printing Office  1914 
 - pp. 81-171 
<br/><br/> Impreso  En biblioteca 2 ejemplares. 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA
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