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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.
2011. Mono County (Calif.) -- Information Technology. This point dataset shows all communities, infrastructure (places), and points of interest (places) within Mono County, California in 2011.