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2008. 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 ozone (O3) ... United States. Bureau of Transportation Statistics.
2007 and 2008. National Center for Ecological Analysis and Synthesis. This raster dataset is a model that measures the impact of sea surface temperature anomalies as a factor in global climate change. Potential for ec... Science.