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Item Some new names and new combinatons for Ceylon plants(University of Peradeniya. Peradeniya, 1959) Abeywickrama, B.A.Item The genera of the liverworts of Ceylon(University of Peradeniya. Peradeniya, 1959) Abeywickrama, B.A.Item A provisional check list of the flowering plants of Ceylon(University of Peradeniya. Peradeniya, 1959) Abeywickrama, B.A.Item The families of the flowering plants of Sri Lanka-Part I.(NSC:Colombo, 1982) Abeywickrama, B.A.; UNESCO-MAB National Committee for Sri LankaItem The genera of the freshwater algae of Sri Lanka-Part II.(NSC:Colombo; 45p, 1986) Abeywickrama, B.A.; Abeywickrama, L.; Arulnanam, P.; Jansen, M.A.B.; UNESCO-MAB National Committee for Sri LankaItem The coastal plants of Sri Lanka-Part I (Salt marsh plants)(NSC:Colombo; 19p, 1993) Abeywickrama, B.A.; Arulgnanam, P.; UNESCO-MAB National Committee for Sri LankaItem The ceylon Ophioglossaceae(University of Peradeniya. Peradeniya, 1973) Abeywickrama, B.A.; De Fonseka, R.N.Item A checklist of the liverworts of Sri Lanka(NSC:Colombo; 10p, 1978) Abeywickrama, B.A.; Jansen, M.A.B.; UNESCO-MAB National Committee of Sri LankaItem The Pteridophytes of the Knuckles region(University of Peradeniya. Peradeniya, 1964) Abeywickrama, B.A.Item The genera of the freshwater algae of Sri Lanka(NSC:Colombo; 103p, 1979) Abeywickrama, B.A.; UNESCO-MAB National Committee for Sri Lanka