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Ciphers, CryptographyShowing 1 featured edition. View all 1 editions?
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Edition Notes
At head of title: War Department, Office of the Chief Signal Officer, Washington.
"Register no. 200."
"The present paper was prepared in 1923. It is a revision of an earlier paper with the same title published in 1922 by the Riverbank Laboratories, Geneva, Ill."-- P. 1.
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