por Symposium of Haifa on Artificial Recharge and Management of Aquifers (1967 : Haifa, Israel) | International Union of Geodesy and Geophysics | International Association of Scientific Hydrology.
por Symposium on Design of Hydrological Networks (1965 : Québec) | Organización Meteorológica Mundial.
por General Assembly of Berkeley. Commission of Snow and Ice (1963) | International Association of Scientific Hydrology.
por General Assembly of Helsinki. Snow and Ice Commission (1960) | International Association of Scientific Hydrology.
por General Assembly of Bern. Commission of Snow and Ice (1967) | International Association of Scientific Hydrology | International Union of Geodesy and Geophysics.
por Symposium on River Morphology (1967 : Berne) | International Union of Geodesy and Geophysics | International Association of Scientific Hydrology.
por General Assembly of Helsinki. Symposium on Antartic Glaciology (1960).
por Symposium of Obergurgl. Commission of Snow and Ice (1962) | International Association of Scientific Hydrology.