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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. Fees and Easements, LCC 22, 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 Landscape Conservation Cooperative (LCC) 22. The USGS Protected Area... Gap Analysis Program (U.S.).

3. Fees and Easements, Puerto Rico, 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 Puerto Rico. The USGS Protected Areas Database of the United States ... Gap Analysis Program (U.S.).

4. 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.

5. 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.

6. 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.

7. 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.

8. 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.

9. 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.

10. 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.