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United States. Bureau of Transportation Statistics
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United States. Bureau of Transportation Statistics
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Stanford
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United States
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2006
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1. Nonattainment Areas for Patriculate Matter Pollution: United States and Territories, 2006
2006. 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 particulate... United States. Bureau of Transportation Statistics.