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

 - 0 
 - ESTADOS UNIDOS  UNITED STATES DEPARTAMENT  1975 
 - 1259 pag.  27 cm 
 - 0  0 .
<br/><br/>PROBLEMS-MINERAL 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CIENCIAS APLICADAS
<br/><br/><label>Dewey Class. No.: </label>622.11  / B94