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EarthWorks
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Level III Ecoregions, Arizona, 2013
US Environmental Protection Agency2013Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. They are designed to...
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Level IV Ecoregions, Arizona, 2013
US Environmental Protection Agency2013Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ...
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Principal Aquifers of the 48 Conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islands
Geological Survey (U.S.). Water Resources Division. Wisconsin District2003This polygon shapefile contains the shallowest principal aquifers of the conterminous United States, Hawaii, Puerto Rico, and the U.S. Virgin Islan...
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