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Sterling, K. (2000, February). Haupt, Herman (1817-1905), railway engineer, inventor, author, and administrator. American National Biography. Retrieved 11 Dec. 2019, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1300718.
Sterling, Keir B. "Haupt, Herman (1817-1905), railway engineer, inventor, author, and administrator." American National Biography. February, 2000. Oxford University Press. Date of access 11 Dec. 2019, <https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1300718>
Sterling, Keir B. "Haupt, Herman (1817-1905), railway engineer, inventor, author, and administrator." American National Biography. 1 Feb. 2000; Accessed 11 Dec. 2019. https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1300718.