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1by Sonneborn, M., Commission of the European Communities, Luxembourg. Directorate-General of Social Affairs eng
Published 1976Texto bibliotecaFAO IT -
2by Brechtel, H.M., European Forestry Commission. Working Party on the Management of Mountain Watersheds eng 1 Oct 1984 Sess. 14 Torremolinos (Spain), Sonneborn, M., Lehnardt, F.
Published 1984Texto bibliotecaFAO IT -
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