Dushantha Mahabanduge සංයුක්ත ගණිතය Combined Mathematics -straight lines - Agasara (pvt) Ltd. Nugegoda 2011 - 199p 1 - 2023-11-01 ISBN: 978-955-0886-03-6 Nat. Bib. No.: 0004745 Nat. Bib. Agency Control No.: MAH Universal Decimal Class. No.: 511.007