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2011. United States. Environmental Protection Agency. Region IX. This polygon shapefile represents nonattainment areas for carbon monoxide (CO) in EPA Region 9, including California, Nevada and Arizona, for 2011.... United States. Environmental Protection Agency. Region IX.
2010. O'Neill, Michael and California. Office of Statewide Health Planning and Development. This polygon shapefile represents zip code tabulation areas (ZCTAs) for the state of California. These data were gathered from the 2010 Census demo... California. Office of Statewide Health Planning and Development.