Perera, H.D. Harman <br/><br/>
විද්‍යා විජ්ජා 
 Vidyaa vijjaa 

 -  M.D. gunasena  1968 
 - 101p., ill.,  17 cm 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Science recreation
<br/><br/><label>Universal Decimal Class. No.: </label>5  / PER