2011. Lubkin, Samantha, Blades, Doug, United States. Federal Highway Administration, and United States. Bureau of Transportation Statistics. This point shapefile depicts the more than 600,000 of the United States' bridges located on public roads, including interstate highways, United Sta... United States. Bureau of Transportation Statistics.
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1971. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.
1990. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.
1978. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.
2008. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.
1979. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.
1990. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.
1997. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.
2008. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.
1987. Stackhouse, Cecil and United States. Bureau of Transportation Statistics. 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.