the symposium was jointly organized by the International Association of Hydrological Sciences (IAHS)and the International Association of Meteorology and Atmospheric Physics (IAMAP) and co-sponsored by the United Nations Educational, Scientific and Cultural Organization (UNESCO) ; edited by H.-J. Bolle, R.A. Feddes, J.D. Kalma
Compiled under the direction of the Centre de documentation sur l'enseignement programmé of the Institut national pour la formation des adultes, Paris, and revised with the assistance of the International Centre for Advanced Technical and Vocational Training, Turin