Biyanvila,Ariyadhasa රසායන විද්යාව A/L - Sanudra Poth Prakashak Colombo 2016 - 260p 1 - 2023-11-15 ISBN: 978-955-680-449-2 Nat. Bib. No.: 0004691 Nat. Bib. Agency Control No.: BIY Universal Decimal Class. No.: 540