27-28th September 2005 part I & II Weerakkody W.J.S.K creator ed. Jayasingha, J.M.U.K Gajanayaka, K.G.M.C.P.B Rathnayaka, R.H.M.K Wickramasingha, W.M.E.P ed. Kelaniyangoda, D.B Makandura 2005 2005 vii, 215p. 29cm WATER CONSERVATION 630.7 PRO 9558746037