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Cassedy, J.  (2000, February). Billings, John Shaw (1838-1913), army medical officer, library organizer, and public health activist. American National Biography. Retrieved 9 Dec. 2019, from https://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-2000067.