Weerakkodi, Sudharma Priyadarshani පරිසර අධ්යයනය 6 ශ්රේණිය = parisara adhyapanaya 6 sheniya - Kegalla: Vishva Praba, 2004. - 71p.; ill.; 27 cm. ISBN: 955-8624-46-2 Subjects--Topical Terms: Land EconomicsEnvironmental Studies Dewey Class. No.: 333.7 / WEE