Usselman, S. W. (2002). Regulating railroad innovation: Business, technology and politics in America, 1840-1920. Cambridge: Cambridge University Press.
Παραπομπή Chicago StyleUsselman, Steven W. Regulating Railroad Innovation: Business, Technology and Politics in America, 1840-1920. Cambridge: Cambridge University Press, 2002.
Παραπομπή MLAUsselman, Steven W. Regulating Railroad Innovation: Business, Technology and Politics in America, 1840-1920. Cambridge: Cambridge University Press, 2002.
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