Rathnayake, Winston <br/><br/>
Science Education Series 

 - Colombo :  Maltilnd,  1983. 
 - 75p.;  21cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>A. Karunasinha Collection<br/> Education, Research, Related Topics
<br/><br/><label>Dewey Class. No.: </label>507.09  / RAT