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Food and Agriculture Organization of the United Nations ,  United Nations Environment Programme ,  [The Przewalski Horse and Restoration to its Natural Habitat in Mongolia: FAO Animal Production and Health Paper 61] ,  The Przewalski Horse and Restoration to its Natural Habitat in Mongolia: FAO Animal Production and Health Paper 61

United Nations Environment Programme ,  Food and Agriculture Organization of the United Nations ,  International Union for Conservation of Nature and Natural Resources ,  [Establishment and Management of Protected Areas in the Gobi region, Mongolian People's Republic: Report of an International Mission (May-June 1976)] ,  Establishment and Management of Protected Areas in the Gobi region, Mongolian People's Republic: Report of an International Mission (May-June 1976)