https://catalogue-scientifique.canada.ca/record=3953002~S6*frc
Rechercher International Union for Conservation of Nature and Natural Resources. Economics Service Unit; Rechercher IUCN World Commission on Protected Areas; Rechercher IUCN World Commission on Protected Areas. Task Force on Economic Benefits of Protected Areas; Rechercher International Union for Conservation of Nature and Natural Resources
IUCN, 1998, ISBN : 9782831704616
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