Jayathilaka, K.M.D.S SMOOTH JOINTS Combined Maths - Lkwa Prakashanayaki Baththaramulla 2002 - 120p 1 - 2023-11-01 ISBN: 955-9779-0-1 Nat. Bib. No.: 0004640 Nat. Bib. Agency Control No.: JAY Universal Decimal Class. No.: 510