Waththegama, T.H විද්යාව 8 ශ්රේණීය - ROYAL Publisher Angoda 2017 - 54p 1 - 2024-01-11 ISBN: 978-955-43041-5-4 Nat. Bib. No.: 0005202 Nat. Bib. Agency Control No.: WAT Universal Decimal Class. No.: 500