1972 E/MJ International directory of mining and mineral processing operations 
/ Miming Informational Services 
 - New York:   Miming Informational Services,   1973 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science
<br/><br/><label>Subjects--Index Terms: </label>Mining 
<br/><br/><label>Universal Decimal Class. No.: </label>R 622.2(058.7)  / L3