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Start Over You searched for: Year 2006 Remove constraint Year: 2006 Place Guam Remove constraint Place: Guam Subject Air quality—Standards Remove constraint Subject: Air quality—Standards

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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.