OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of science level 2- physics PS 

 - Nugegoda  The Open University of Sri Lanka  1989 
 - 205 p. 
<br/><br/><label>ISBN: </label>139477 
<br/><br/><label>Dewey Class. No.: </label>537  / OPE