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The National Academies, Transportation Research Board, TR News, The Intermodal Container Era: History, Security, and Trends, no. 246, September – October 2006, available at www.trb.org.
U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, Transportation Indicators Report, August 2002, available at http://www.bts.gov/publications/transportation_indicators/august_2002/.
U.S. Department of Transportation, Maritime Administration, Vessel Calls at U.S. and World Ports 2005, April 2006, Washington, DC., available at www.marad.dot.gov/marad_statistics, as of December 2006.
U.S. Department of Transportation, Federal Highway Administration, Office of Freight Operations, Freight Facts and Figures 2006, Washington DC, available at www.ops.fhwa.dot.gov/freight.
U.S. Department of Transportation, Research and Innovative Technology Administration, Bureau of Transportation Statistics, North American Freight Transportation, June 2006, Washington, DC: 2006.
U.S. Department of Homeland Security, Customs and Border Protection, Mission Support Services, Operations Management Database CD, various years.