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1. 1:1,000,000-Scale National Wilderness Preservation System of the United States, 2014

2014. National Atlas of the United States. This polygon shapefile consists of National Wilderness Preservation System areas of 320 acres or more, in the United States, Puerto Rico, and the U... National Atlas of the United States.

2. Administrative Boundaries of National Park System Units, 2011

2011. United States. Bureau of Transportation Statistics. This polygon shapefile depicts service wide boundary set for display and general analysis purposes. This layer is part of the 2014 National Transpo... United States. Bureau of Transportation Statistics.

3. Easements, Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Easements features for the United States. The USGS Protected Areas Database of the United States (P... Gap Analysis Program (U.S.).

4. Environmental Health Hazard Index, 2015

2015. United States. Department of Housing and Urban Development. The environmental health hazard exposure index summarizes potential exposure to harmful toxins at a neighborhood level. Potential health hazards ex... United States. Department of Housing and Urban Development.

5. Fees and Easements, Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains combined PAD-US Fee and Easements features for the United States. The USGS Protected Areas Database of the United S... Gap Analysis Program (U.S.).

6. Fees, Protected Areas Database of the United States, 2005-2016

2005. Gap Analysis Program (U.S.). This polygon shapefile contains PAD-US Fees features for the United States. The USGS Protected Areas Database of the United States (PAD-US) is the ... Gap Analysis Program (U.S.).

7. 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).

8. 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).

9. National Wilderness Preservation System of the United States, 2006

1972. National Atlas of the United States. This polygon shapefile contains National Wilderness Preservation System areas of 640 acres or more, in the United States, Puerto Rico, and the U.S.... National Atlas of the United States.

10. Nonattainment Areas for Carbon Monoxide Pollution: United States and Territories, 1971

1971. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the carbon mono... United States. Bureau of Transportation Statistics.

11. Nonattainment Areas for Carbon Monoxide Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the carbon mono... United States. Bureau of Transportation Statistics.

12. Nonattainment Areas for Lead Pollution: United States and Territories, 1978

1978. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the lead (Pb) 3... United States. Bureau of Transportation Statistics.

13. Nonattainment Areas for Lead Pollution: United States and Territories, 2008

2008. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the lead (Pb) 3... United States. Bureau of Transportation Statistics.

14. Nonattainment Areas for Nitrogen Dioxide Pollution: United States and Territories, 1971

1971. Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the nitrogen di... United States. Bureau of Transportation Statistics.

15. Nonattainment Areas for Nitrogen Dioxide Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the nitrogen di... United States. Bureau of Transportation Statistics.

16. Nonattainment Areas for Ozone Pollution: United States and Territories, 1979

1979. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3) ... United States. Bureau of Transportation Statistics.

17. Nonattainment Areas for Ozone Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3)1... United States. Bureau of Transportation Statistics.

18. Nonattainment Areas for Ozone Pollution: United States and Territories, 1997

1997. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3) ... United States. Bureau of Transportation Statistics.

19. Nonattainment Areas for Ozone Pollution: United States and Territories, 2008

2008. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the ozone (O3) ... United States. Bureau of Transportation Statistics.

20. Nonattainment Areas for Patriculate Matter Pollution: United States and Territories, 1987

1987. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.

21. Nonattainment Areas for Patriculate Matter Pollution: United States and Territories, 1990

1990. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.

22. Nonattainment Areas for Patriculate Matter Pollution: United States and Territories, 1997

1997. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.

23. Nonattainment Areas for Patriculate Matter Pollution: United States and Territories, 2006

2006. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the particulate... United States. Bureau of Transportation Statistics.

24. Nonattainment Areas for Sulfur Dioxide Pollution, United States and Territories, 1971

1971. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the sulfur diox... United States. Bureau of Transportation Statistics.

25. Nonattainment Areas for Sulfur Dioxide Pollution, United States and Territories, 1978

1978. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the sulfur diox... United States. Bureau of Transportation Statistics.

26. Nonattainment Areas for Sulfur Dioxide Pollution, United States and Territories, 2010

2010. United States. Bureau of Transportation Statistics and Stackhouse, Cecil. This polygon shapefile depicts nonattainment and maintenance areas for the United States and its Territories for the enforcement of the sulfur diox... United States. Bureau of Transportation Statistics.

27. United States Parks, 2010-2014

2010. Tele Atlas (Firm : U.S.) and Environmental Systems Research Institute (Redlands, Calif.). This polygon shapefile contains the boundaries of parks, gardens, and forests within the United States at national, state, county, regional, and lo... Environmental Systems Research Institute (Redlands, Calif.).

28. U.S. National Atlas Federal Land Areas, 2014

2014. National Atlas of the United States and the United States Geological Survey and Esri. U.S. National Atlas Federal Land Areas represents the federally owned or administered land areas (for example, National Wildlife Refuges, National ... Esri.

29. U.S. Parks, 2013

2012. TomTom North America, Inc. U.S. Parks represents parks, gardens, and forests within the United States at national, state, county, regional, and local levels.

30. U.S. Parks, 2018

2018. TomTom North America, Inc. and Esri. U.S. Parks represents parks, gardens, and forests within the United States at national, state, county, regional, and local levels. Esri.