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Crouch, T.  (2000, February). Langley, Samuel Pierpont (1834-1906), astrophysicist and aviation experimenter. American National Biography. Retrieved 17 Jan. 2020, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-1300946.