Non aligned conference lssue : gems of sri Lanka 

 - Colombo :  Galle Face Terrace, 
 - 25p.;  25cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Earth Sciences<br/>Gem 
<br/><br/><label>Dewey Class. No.: </label>553.8  / GEM