New technologies for coal mining industry    Papers    

 - Calcutta  The Author India          1988 
 - 83p.  cm. 
<br/><br/><label>Source: </label> General Book 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Minings
<br/><br/><label>Dewey Class. No.: </label>X9(HZ551).ogf.2.N8, M8