Department,Vidhya උසස් පෙළ ජීව විද්යාව - Vidhya Department Pitakotte 2020 - 117p 1 - 2023-11-21 ISBN: 978-955-654-881-5 Nat. Bib. No.: 0008461 Nat. Bib. Agency Control No.: DEP Universal Decimal Class. No.: 573