Department of Education භෞතික විද්යාව ප්රයෝගික අත්පොත - Department of Education Publisher Mahargama 2017 - 99p 1 - 2024-01-29 ISBN: 978-955-654-650-7 Nat. Bib. No.: 0008449 Nat. Bib. Agency Control No.: SCI Universal Decimal Class. No.: 540