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2013
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1. Level III Ecoregions, Arizona, 2013
2013. US Environmental Protection Agency. Ecoregions denote areas of general similarity in ecosystems and in the type, quality, and quantity of environmental resources. They are designed to... U.S. EPA Office of Research & Development (ORD) - National Health and Environmental Effects Research Laboratory (NHEERL).
2. Level IV Ecoregions, Arizona, 2013
2013. US Environmental Protection Agency. Ecoregions by state were extracted from the seamless national shapefile. Ecoregions denote areas of general similarity in ecosystems and in the typ... U.S. EPA Office of Research and Development (ORD) - National Health and Environmental Effects Research Laboratory (NHEERL).
3. SSURGO Soils Dataset, Arizona, 2013
2013. United States. Department of Agriculture. This data set is a digital soil survey and generally is the most detailed level of soil geographic data developed by the National Cooperative Soil ... U.S. Department of Agriculture, Natural Resources Conservation Service.