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Source: U.S. Department of Transportation, Federal Highway Administration, Nationwide Personal Transportation Survey data...
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Active fleet Ships Deadweight tons (000...Source: A. Pisarski, Commuting in America II (Lansdowne, VA: Eno Transportation Foundation, Inc., 1996).
Source: U.S. Department of Transportation, Bureau of Transportation Statistics, 1995 American Travel Survey: U.S. Profile (Washington, DC:...
Source: U.S. Department of Transportation, Federal Highway Administration, Joint Program Office for Intelligent Transportation Systems, Tracking...
Source: U.S. Department of Transportation, Bureau of Transportation Statistics, Transborder Surface Freight data (Washington, DC: Various...
Source: United Nations Conference on Trade and Development, Review of Maritime Transport 1999 (New York, New York: 1999).
Source: U.S. Department of Energy, Energy Information Administration, Emissions of Greenhouse Gases in the United States, 1998 (Washington, DC...
Source: U.S. Department of Transportation, Office of Intelligence and Security, Worldwide Terrorist and Violent Criminal Attacks Against...
Source: U.S. Environmental Protection Agency, Office of Air and Radiation, Air Quality Planning and Standards, National Air Pollution...