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, Ethopia, 10-15 October 1988.
United Nations Interregional Meeting on River and Lake Basin Development with Emphasis on the Africa Region.(1988 :Ethiopia)
United Nations.Department of Technical Co-operation for Development.
New York : United Nations,
1990.
At head of title :  United Nations Department of Technical Co-operation for Development.
Watershed management
Watersheds