Hemachandra Basnayaka රසායන විද්යාව -1 - S.Godage&Brothers Colombo 2015 - 348p 1 - 2023-11-29 ISBN: 978-955-30-5854-6 Nat. Bib. No.: 0006068 Nat. Bib. Agency Control No.: BAS Universal Decimal Class. No.: 540