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Item Seminar on alternatives to river sand(NSF:Colombo, 2003)Item Sustainability in tourism through government regulations(People's Bank. Colombo, 2000) Micheal, K.A.D.G.Item Eroding coast - a serious environmental problem(NARESA:Colombo, 1990) Wilson, W.N.Item Mid-holocene sea level changes in Sri Lanka(National Science Council:Colombo, 1988) Weerakkody, U.Item Corals and their values(Natinal Resources, Energy Science Authority of Sri Lanka:Colombo, 1991) Weerakkody, U.