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US Environmental Protection Agency. (2013-04-16T:00:00:00). Level IV Ecoregions, Arizona, 2013. [Shapefile]. U.S. EPA Office of Research and Development (ORD) - National Health and Environmental Effects Research Laboratory (NHEERL). Retrieved from https://geodata.lib.arizona.edu/catalog/uarizona-arizona-level4ecoregions-2013