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Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS). Federal Highway Administration, Office of Planning, HEPP-1. (). United States Non-Attainment Areas: Sulfur Oxides, 2008. [Shapefile]. Research and Innovative Technology Administration's Bureau of Transportation Statistics (RITA/BTS). Retrieved from https://geo.nyu.edu/catalog/sde-columbia-ntad_2008_naa_sox