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>NOTE: Train crossings do not appear because they are relatively small in comparison to other modes. Please see Table 3-19 for the number of train crossings from Mexico and Canada.
SOURCE: U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Border Crossing/Entry Data, available at http://www.transtats.bts.gov/BorderCrossing.aspx as of July 2010.