Proceedings of the research seminar coal-a petrographic approach  
/ Department of Geology  
 - Nagpur:   Department of Geology,   1968  
 - 81p.  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Petrograph 
<br/><br/><label>Universal Decimal Class. No.: </label>553.9(082.2)  / K8