ICUN Red List of Threatened Species

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International Union for Conservation of Nature and Natural Resources
Provides taxonomic classification, conservation status and distribution information on species that have been evaluated using IUCN Red List Categories and Criteria. This system is designated to determine the relative risk of extinction and highlights those species that are facing higher risk of global extinction.
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University of Arizona

The Rangelands West collection includes articles, websites, reports, and multimedia resources focused on issues relevant to the Western U.S.  Also included are resources emanating from the 19 land-grant universitires that are members of the Rangelands Partnership and made available throught their respective state Rangelands websites.