Image: Seneca code instructions.agr
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Description: Page from the U.S. Army World War I trench code, Seneca edition, from American Army Field Codes In the American Expeditionary Forces During The First World War, William Friedman, U.S. War Department, June 1942, p. 185 ff
Title: Seneca code instructions.agr
Credit: https://www.nsa.gov/Portals/75/documents/news-features/declassified-documents/friedman-documents/publications/FOLDER_267/41784809082383.pdf
Author: US Army, via William Friedman
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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