Sterrett, Douglas B. <br/><br/>
Gems and precious stones in 1913. 

 - Washington, D.C.  Government Printing Office  1914 
 - pp. 649-708 
 - 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/>PIEDRAS PRECIOSAS<br/>GEMAS
<br/><br/><label>Dewey Class. No.: </label>553.8