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
Survival Service Commission
Bok Språk ikke angitt 1980