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economy
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Columbia
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2012
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1. United States States (No Shoreline), 2013
2012. United States. Bureau of Transportation Statistics, United States. Department of Transportation. Research and Innovative Technology Administration, and United States. Bureau of the Census. State boundaries with political limit - boundaries extending into the ocean. The State Boundary with Detailed Shorelines database was created using... U.S. Census Bureau (BOC).
2. United States Freight Analysis Framework, 2013
2012. United States. Bureau of Transportation Statistics and United States. Federal Highway Administration. The spatial component of the FAF network is derived from National Highway System Version 2009.11 and contains state primary and secondary roads, Na...