Science Investigations=விஞ்ஞான ஆய்வுகள் 

 - Colombo  Natural Resources, Energy and Science Authority of Sri Lanka  1982 
 - 55 p. 
<br/><br/><label>ISBN: </label>188854 
<br/><br/><label>Dewey Class. No.: </label>507.2  / SCI