47
U. S. Energy Information Administration, "Annual Energy Review 2011", table. E1.
48
McDougall, Throes of Democracy, 143.
49
Greene, Horses at Work, 55.
50
Там же, 166.
51
George Rogers Taylor, The Transportation Revolution 1815–1860 (New York: M. E. Sharpe, 1951), 15–17.
52
Там же, 132–133.
53
Greene, Horses at Work, 52.
54
Louis Cain, ed., "Transportation", Economic Sectors, vol. 4 of Historical Statistics of the United States: Millennial Edition, 762.
55
Greene, Horses at Work, 78.
56
Daniel Walker Howe, What Hath God Wrought: The Transformation of America, 1815–1848 (Oxford: Oxford University Press, 2007), 214.
57
Cain, "Transportation", Economic Sectors, vol. 4 of Historical Statistics of the United States: Milliennial Edition, 770.
58
Там же.
59
Albert Fishlow, American Railroads and the Transformation of the Antebellum Economy (Cambridge, MA: Harvard University Press, 1965); Robert Fogel, Railroads and American Economic Growth (Baltimore: Johns Hopkins University Press, 1964).
