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United States. Bureau of Transportation Statistics
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United States. Bureau of Transportation Statistics
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Puerto Rico
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American Samoa
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1971
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1. Nonattainment Areas for Carbon Monoxide Pollution: United States and Territories, 1971
1971. 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 carbon mono... United States. Bureau of Transportation Statistics.
2. Nonattainment Areas for Sulfur Dioxide Pollution, United States and Territories, 1971
1971. 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.