Department of education ජීව විද්යාව 12 /13 ශ්රේණී : - Department of education : Maharagama ; 2012. - 321 p 21 cm . 01 - 2025-09-09 Nat. Bib. No.: 0011450 Nat. Bib. Agency Control No.: DEP Universal Decimal Class. No.: 620