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.
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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 particulate... United States. Bureau of Transportation Statistics.
1997. Environmental Systems Research Institute (Redlands, Calif.) and United States. Bureau of Transportation Statistics. This line shapefile represents rural and urban interstate highways. U.S. National Transportation Atlas Interstate Highways is part of the National ... Environmental Systems Research Institute (Redlands, Calif.).