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Tenth General Assembly [of the International Union for Conservation of Nature and Natural Resources], Vigyan Bhavan, New Delhi, 24 November-1 December, 1969
International Union for Conservation of Nature and Natural Resources. General Assembly
其他書名
Proceedings and summary of business
出版International Union for Conservation of Nature and Natural Resources, 1970
URLhttp://books.google.com.hk/books?id=M9CXGwAACAAJ&hl=&source=gbs_api