Weragoda, Ravindra රසායන විද්යාව 10 ශ්රේණීය - S,Godage Publisher Colombo 2008 - 116p 1 - 2023-11-27 ISBN: 978-955-30-1166-4 Nat. Bib. No.: 0002462 Nat. Bib. Agency Control No.: WER Universal Decimal Class. No.: 540