12th congress of world mining congress minier mondial 
/ Organizing Committee of the 12th congress of world mining congress 
 - New Delhi:    Organizing Committee of the 12th congress of world mining congress,    1984 
<br/><br/><label>Subjects--Topical Terms: </label>
<br/><br/><label>Subjects--Index Terms: </label>Ecology 
<br/><br/><label>Universal Decimal Class. No.: </label>622.2(047.3)  / M4