OPEN University of Sri Lanka <br/><br/>
Course of study leading to the degree of bachelor of scienc level 5 PSU 3118-phy 

 - Nugegoda  The Open University of Sri Lanka  1989 
 - 95 p. 
<br/><br/><label>ISBN: </label>123695 
<br/><br/><label>Dewey Class. No.: </label>541.37  / OPE