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21. 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.
22. 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.
23. 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.
24. 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.
25. 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.
26. Significant United States Earthquakes, 1568-2009
1568. Geological Survey (U.S.). This point shapefile contains the locations and attributes of significant, historic earthquakes that caused deaths, property damage, and geological... National Atlas of the United States.
27. Spread of Africanized Honey Bees in the United States, 1990-2005
1990. United States. Agricultural Research Service. This polygon shapefile portrays the spread, by year, of the Africanized honey bee (AHB) in the United States, Puerto Rico, and the U.S. Virgin Isla... National Atlas of the United States.
28. 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.).
29. U.S. Geographic Names Information System Summit 2002
2000. United States Geological Survey. U.S. Geographic Names Information System Summit represents an automated inventory of the proper names and locations of physical and cultural geogra... Environmental Systems Research Institute, Inc. (ESRI).
30. 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.
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