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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.
2010. Geological Survey (U.S.) and United States. Bureau of Transportation Statistics. This point shapefile depicts cities and towns in the United States, Puerto Rico, and the United States Virgin Islands. A city or town is a place wi... United States. Bureau of Transportation Statistics.