Hewett, D.F. <br/><br/>
The production of manganese and manganiferous ores in 1913. 

 - Washington, D.C.  Government Printing Office  1914 
 - pp. 57-74 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA
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