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IUCN yearbook.

APA Citation

International Union for Conservation of Nature and Natural Resources. (1971). IUCN yearbook. Morges, Switzerland: International Union for Conservation of Nature and Natural Resources.

MLA Citation

International Union for Conservation of Nature and Natural Resources. IUCN Yearbook. Morges, Switzerland: International Union for Conservation of Nature and Natural Resources, 1971.

Warning: These citations may not always be complete (especially for serials).