Course in military codes and ciphers / by Capt. W.F. Friedman : typescript, 1922.
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Friedman, William F. (William Frederick), 1891-1969
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William F. Friedman was born in Russia and emigrated to the United States with his family as a child. Trained as a plant geneticist, he worked as a cryptologist in the private sector before joining the Office of the Chief Signal Officer, U.S. War Dept., in December 1919 as chief cryptanalyst. From the description of Cryptography translations : typescripts, 1924-1934. (University of Pennsylvania Library). WorldCat record id: 122629190 ...
U.S. Army Signal School
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