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Item A comparative study of the geochemistry of Arsenic, Antimony and Bismuth in minerals from a fractionated sequence(National Science Council:Colombo, 1977) Dissanayake, C.B.Item Water quality in the dry zone of Sri Lanka - some interesting health aspects(National Science Foundation:Colombo, 2005) Dissanayake, C.B.Item Water quality in the dry zone of Sri Lanka - some interesting health aspects(National Science Foundation. Colombo, 2005) Dissanayake, C.B.Item Fluoride in groundwater and its impact on kidney diseases in the dry zone(SLAAS. Colombo, 2010) Dissanayake, C.B.Item The niobium and yttrium abundances in the sedimentary gem deposits of Sri Lanka(National Science Council:Colombo, 1986) Dissanayake, C.B.; Rupasinghe, M.S.Item The environment - role of earth scientists(NARESA:Colombo, 1990) Dissanayake, C.B.