Search Constraints
You searched for:
Subject
Boundaries
Remove constraint Subject: Boundaries
Subject
Location
Remove constraint Subject: Location
Place
United States
Remove constraint Place: United States
Year
2013
Remove constraint Year: 2013
1 - 4 of 4
Search Results
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. United States Census Urbanized Areas, 2010
2013. U.S. Census Bureau. Geography Division and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile represents the 2010 Census urban areas in the United States. An urban area comprises a densely settled core of census tracts... Environmental Systems Research Institute (Redlands, Calif.).
4. U.S. Census Urban Areas, 2013
2013. U.S. Department of Commerce, Census Bureau, Geography Division and Esri. U.S. Census Urban Areas represents the 2010 Census urban areas in the United States. An urban area comprises a densely settled core of census tract... Esri.