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  1. By: IUCN Conservation Monitoring Centre. - Global Environmental Monitoring System.
    Publication info: Gland, Switzerland :International Union for Conservation of Nature and Natural Resources,1986.
    Holding Institution: UNEP-WCMC, Cambridge (archive.org)
  2. By: IUCN Conservation Monitoring Centre.
    Publication info: IUCN Conservation Monitoring Centre
    Holding Institution: UNEP-WCMC, Cambridge (archive.org)
  3. By: IUCN Conservation Monitoring Centre.
    Publication info: IUCN Conservation Monitoring Centre
    Holding Institution: UNEP-WCMC, Cambridge (archive.org)
  4. By: IUCN Conservation Monitoring Centre.
    Publication info: UNESCO, IUCN Conservation Monitoring Centre
    Holding Institution: UNEP-WCMC, Cambridge (archive.org)