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Weisberger, W.  (2019, July 25). Leffingwell, Russell C. (10 Sept. 1878–2 Oct. 1960), lawyer, financier, and federal government official. American National Biography. Retrieved 9 Apr. 2020, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-112807.