articleEnvironmental ManagementSep 15, 2014Closed access

Ecoregions of the Conterminous United States: Evolution of a Hierarchical Spatial Framework

JMJames M. OmernikGEGlenn E. Griffith

United States Geological Survey · Environmental Protection Agency

PubMed
Indexed incrossrefpubmed

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995
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100%
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88
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2

Topics & keywords

Topics
Keywords
  • Ecoregion
  • Resource (disambiguation)
  • Geography
  • Environmental resource management
  • Scale (ratio)
  • Variety (cybernetics)
  • Underpinning
  • Ecology
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