Has participated in:
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Classification and use of protected natural and cultural areas : A report prep. at the IUCN General Assembly at Banff, Canada, sept. 1972 and the 2. World Conference on National Parks at Grand Teton...
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A System for defining and classifying natural regions for purposes of conservation : A progress report
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Bedrohte Natur : der Mensch u. d. Biosphäre