Sawarna Dhanapala ජීව විද්යාව - 11 ශේණීය - Sarasawi Publisher Nugegoda 2016 - 243p 1 - 2023-10-17 ISBN: 978-955-31-0604-9 Nat. Bib. No.: 0004496 Nat. Bib. Agency Control No.: DAN Universal Decimal Class. No.: 570