Katz, Frank J. <br/><br/>
Feldspar in 1916. 

 - Washington, D.C.  Government Printing Office  1917 
 - pp. 173-184 
 - 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/>FELDESPATO
<br/><br/><label>Dewey Class. No.: </label>549.68