Kumaragamage, Darshani <br/><br/>
Rocks and minerals 

 -  Natural resources energy & science authority  1986 
 - 82p.,  21 cm 
 - Science education series 14 .
<br/><br/><label>Subjects--Topical Terms: </label><br/>Rock <br/>Geology <br/>Mineralogy <br/>Mineral
<br/><br/><label>Universal Decimal Class. No.: </label>552  / THE