Marasinghe, Basil <br/><br/>
Proceedings of the seminar mining and mineral engineering 

 -  Natural resources energy & science authority  1998 
 - 56p., ill.,  24 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mineral <br/>Gem
<br/><br/><label>Universal Decimal Class. No.: </label>549  / MAR