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River and lake basin development
proceedings of the United Nations Interregional Meeting on River and Lake Basin Development with Emphasis on the Africa Region, Addis Ababa, Ethiopia, 10 - 15 October 1988 -
River and lake basin development
proceedings of the United Nations Interregional Meeting on River and Lake Basin Development with emphasis on the Africa region ; Addis Ababa, Ethiopia, 10-15 October 1988