Polar bears : proceedings of the seventh Working Meeting of the IUCN Polar Bear Specialist Group and proceedings of the sixth working Meeting of the IUCN Polar Bear Specialist Group

Polar bears : proceedings of the seventh Working Meeting of the IUCN Polar Bear Specialist Group, held at the Arktisk Institut, Copenhagen, Denmark, 30 January-1 February 1979 and proceedings of the sixth working Meeting of the IUCN Polar Bear Specialist Group, held at IUCN Headquarters, Switzerland, 7-10 December 1976