Phalen, W.C. <br/><br/>
Sulphur, pyrite, and sulphuric acid in 1913. 

 - Washington, D.C.  Government Printing Office  1914 
 - pp. 23-47 
 - Mineral Resources of the United States, calendar year 1913-Part II .
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>AZUFRE<br/>PIRITA<br/>ACIDO SULFURICO
<br/><br/><label>Dewey Class. No.: </label>661