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References
- ↑ Rosenberg, Nathan. "Technological change in the machine tool industry, 1840–1910." The Journal of Economic History 23.04 (1963): 414-443.
- ↑ Usher, Abbott Payson. A History of Mechanical Inventions: Revised Edition. Courier Dover Publications, 2013.
- 1 2 Roe family papers at Yale University. Accessed 11.2014.
