BURESU OF MINES <br/><br/>
MINERAL FACTS AND PROBLEMS 

 - 0 
 - U.S.A.  UNITED STATES GOVERNMENT  0 
 - 1042 pag  26 cm 
 - 1956 .
 - 0  0 .
<br/><br/>MINERAL INDUSTRIES-NONMETALLIC 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CIENCIAS PURAS
<br/><br/><label>Dewey Class. No.: </label>549  / B94