Department of Education ඉංජිනේරු තාක්ෂණවේදය : 2015- 2017 - Department of Education : Maharagama ; 2019. - 276 p ; 21 cm . 01 - 2025-07-16 ISBN: 9789552505355 Nat. Bib. No.: 0008088 Nat. Bib. Agency Control No.: DEP Universal Decimal Class. No.: 658