Hydrology of humid tropical regions : aspects of tropical cyclones, hydrological effects of agriculture and forestry practice : proceedings of a symposium held during the XVIIIth General Assembly of the International Union of Geodesy and Geophysics at Hamburg, Federal Republic of Germany, 15-27 August 1983 / edited by Reiner Keller / Washington (D.C.) : International Association of Hydrological Sciences , 1983