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Work cat.: (senamhi): Conference on Hydrology and Hydrometeorology in the Economic Development of Africa Addis-Abeba, Etiopía 1971 29282, The role of hydrology and hydrometeorology in the economic development of Africa = Le rôle de l'hydrologie et de l'hydrométéorologie dans le développement économique de l'Afrique: proceedings of the Conference on Hydrology and Hydrometeorology in the Econ, 1972