https://catalogue-scientifique.canada.ca/record=1059111~S6*frc
Rechercher International Union for Conservation of Nature and Natural Resources. Polar Bear Specialist Group. Working Meeting St. Prex, Switzerland) (5th; Rechercher International Union for Conservation of Nature and Natural Resources. Survival Service Commission; Rechercher International Union for Conservation of Nature and Natural Resources; Rechercher International Union for Conservation of Nature and Natural Resources. Species Survival Service Commission. Polar Bear Specialist Group
International Union for Conservation of Nature and Natural Resources, 1976
Actes de conférence