Minerals Yearbook 1993. Volume I: Metals and minerals 
U.S. Bureau of mines. 
 - Washington  Government printing office  1993 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Anuario<br/>Metales y minerales<br/>minerales<br/>metales
<br/><br/><label>Universal Decimal Class. No.: </label>549 (797) (058)