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2by 121497 STASSEN, H.E.M., 122544 SWAAIJ, W.P.M. VAN., 12721 International Institute for Environment and Development, Londres (RU), 7290 El Colegio de México, (México), 35866 International Symposium on Energgy Strategies for Subsistence Agriculture, México (México), 28 Jun-8 Jul 1981bibliotecaIICA