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  1. Standards for associations and alliances of the U.S. National Vegetation Classification

    PublicationJournal ArticleEcological Monographs
  2. Geographic Patterns of At-Risk Species

    PublicationJournal ArticleUS Forest Service Report
  3. How many endangered species are there in the United States?

    PublicationJournal ArticleFrontiers in Ecology & the Environment

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