Ferguson, Henry G. <br/><br/>
Graphite in 1916. 

 - Washington, D.C.  Government Printing Office  1917 
 - pp. 43-59 
 - Mineral Resources of the United States, 1916-Part II .
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA<br/>GRAFITO
<br/><br/><label>Dewey Class. No.: </label>553.26