Proceedings of the twenty eighth Annual session: Ceylon Association for the advancement of science ශ්‍රී ලංකා විද්‍යාභිවර්ධන සංගමය 

 - Colombo :  Ceylon Association for the Advancement  of Science,  1971 
 - 262p.;  21cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Conference Proceeding