by Intermediate Technology Development Group | Technical Centre for Agricultural and Rural Cooperation (Ede, Netherlands) | Groupe de recherche et d'�echanges technologiques.
by Albrecht, Hartmut, 1925- | Hoffmann, Volker | Hoffmann, Waltraud | German (West). Bundesministerium f�ur Wirtschaftliche Zusammenarbeit | Deutsche Gesellschaft f�ur Technische Zusammenarbeit | Technical Centre for Agricultural and Rural Cooperation (Ede, Netherlands).
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