Coons, A.T. <br/><br/>
The production of slate in 1913. 

 - Washington, D.C.  Government Printing Office  1914 
 - pp. 71-84 
 - 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/>PIZARRA
<br/><br/><label>Subjects--Index Terms: </label>PRODUCCION DE PIZARRA 
<br/><br/><label>Dewey Class. No.: </label>553