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United States. Bureau of Transportation Statistics
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Environment
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Stanford
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Year
2010
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1. 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.