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United States. Bureau of Transportation Statistics
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1978
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1. 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.
2. 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.