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).
