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1by International Union of Geodesy and Geophysics. General Assembly, 12th, Helsinki, 1960, International Union of Geodesy and Geophysics, International Association of Scientific Hydrology, International Association of Scientific Hydrology. Commission of Land Erosion, International Association of Scientific Hydrology. Committee of Precipitation, International Association of Scientific Hydrology. Committee of Evaporation and Evapo-transpiration, International Association of Scientific Hydrology. Committee of Instruments, International Association of Scientific Hydrology. Committee of Standardization, International Association of Scientific Hydrology. Committee of Dissolved Mattersbook bibliotecaUNESCO