William F. Friedman NSA Archive - Technical Paper by Frank B. Rowlett, Junior Cryptanalyst, Further Applications of the Principles of Indirect Symmetry of Position In Secondary Alphabets, War Department, Office of the Chief Signal Officer, 1935

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Files W.F.F. Archive Publications Technical Paper by Frank B. Rowlett, Junior Cryptanalyst, Further Applications of the Principles of Indirect Symmetry of Position In Secondary Alphabets, War Department, Office of the Chief Signal Officer, 1935

Further Applications of the Principles of Indirect Symmetry of Position In Secondary Alphabets, Register No. 135; by Frank B. Rowlett

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