Harrison, I. (2003). Transportation Energy Efficiency Trends in the 1990s. United States. Department of Transportation. Bureau of Transportation Statistics. https://doi.org/10.21949/1501627
Harrison, Ivy. Transportation Energy Efficiency Trends in the 1990s. United States. Department of Transportation. Bureau of Transportation Statistics, 2003. https://doi.org/10.21949/1501627.
Harrison, Ivy Transportation Energy Efficiency Trends in the 1990s. United States. Department of Transportation. Bureau of Transportation Statistics, 2003, ROSA P. https://doi.org/10.21949/1501627.
In the 1990s the transportation sector showed little increase in energy efficiency as transportation activity and energy use continued to grow. Passenger travel energy-efficiency levels improved slightly, mainly due to efficiency gains in the aviation sector. Freight transportation energy-efficiency levels declined slightly as modes of transportation that consumed the most energy for freight movement became less energy efficient.
Harrison, I. (2003). Transportation Energy Efficiency Trends in the 1990s. United States. Department of Transportation. Bureau of Transportation Statistics. https://doi.org/10.21949/1501627
Harrison, Ivy. Transportation Energy Efficiency Trends in the 1990s. United States. Department of Transportation. Bureau of Transportation Statistics, 2003. https://doi.org/10.21949/1501627.
Harrison, Ivy Transportation Energy Efficiency Trends in the 1990s. United States. Department of Transportation. Bureau of Transportation Statistics, 2003, ROSA P. https://doi.org/10.21949/1501627.
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