Trench code (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Trench code" in English language version.

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archive.org

"Manual for the solution of military ciphers". Fort Leavenworth, Kan., Press of the Army Service Schools. 1916.

*American Army Field Codes In the American Expeditionary Forces During The First World War, William Friedman, U.S. War Department, June 1942. Contains many examples in its appendix, including a "Baseball code" (p. 254)

"[4.0] Codes & Codebreakers In World War I". www.vectorsite.net. Archived from the original on December 5, 2005. Retrieved 2016-01-07.