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O’Neil, W.  (2007, October). Mitchell, Billy (1879-1936), army officer, air war pioneer, and air policy advocate. American National Biography. Ed.   Retrieved 9 Dec. 2018, from http://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0600441.