UNITED STATES DEPARTAMENT OF THE INTERIOR <br/><br/>
YEARBOOK MINERALS 

 - 0 
 - WASHINGTON  BEREAU OF MINES  1970 
 - 979 pag.  24 cm 
 - 0  4 .
<br/><br/>YEARBOOK-MINERALS/1968 
<br/><br/><label>Subjects--Topical Terms: </label><br/>OBRAS GENERALES
<br/><br/><label>Dewey Class. No.: </label>050.549  / U61