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Wepman, D.  (2009, October). Johnston, Philip (1892-1978), proponent of use of the Navajo code-talker system in World War II. American National Biography. Ed.   Retrieved 17 Nov. 2018, from http://www.anb.org/view/10.1093/anb/9780198606697.001.0001/anb-9780198606697-e-0600889.