European Working Conference on Environmental Conservation Education, Rüschlikon near Zürich, Switzerland, 15-18 December 1971 : final report
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European Working Conference on Environmental Conservation Education, Rüschlikon near Zürich, Switzerland, 15-18 December 1971 : final report
（IUCN publications, new ser. ; supplementary paper ; no. 34）
International Union for Conservation of Nature and Natural Resources, 1972
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