Книга: Капитализм в Америке: История
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Ann Norton Greene, Horses at Work: Harnessing Power in Industrial America (Cambridge, MA: Harvard University Press, 2008), 48.

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Alan L. Olmstead and Paul W. Rhode, ed., "Crops and Livestock", Economic Sectors, vol. 4 of Historical Statistics of the United States: Millennial Edition, 18.
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