DescriptionSigning ceremony. IAEA/GSF agreement on isotope hydrology research for better water supply: Prof. R. Wittenzellner (left) and Dr. R. Gerold (right) of the Gesellschaft fuer Strahlen- und Umweltforschung (GSF), Muenchen; Dr. Sigvard Eklund, IAEA Director General (centre) (see Press Release 80/3).