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M.L.A (9 ম সংস্করণ) উদ্ধৃতিSymposium in Hydrology of Deltas, Bucharest, et al. Hydrology of Deltas: Proceedings of the Bucharest Symposium, 6-14, May 1969 = Hydrologie Des Deltas : Actes Du Colloque De Bucarest, 6-14, Mai, 1969. IASH-AIHS-Unesco, 1970.