Basnayaka,Hemachandara රසායන විද්යාව - S.Godage Publisher Colombo 2012 - 240p 1 - 2023-11-20 ISBN: 978-955-30-3436-6 Nat. Bib. No.: 0004534 Nat. Bib. Agency Control No.: BAS Universal Decimal Class. No.: 540