William F. Friedman NSA Archive - Cryptographic Codes and Ciphers: Spanish Convenience Code Book "Y", 1932 - 4in1

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Files W.F.F. Archive Reports and Research Notes Cryptographic Codes and Ciphers: Spanish Convenience Code Book "Y", 1932

Description of the Solution of A Spanish Diplomatic Code In 1918-19; Contains Note by Friedman Dated January 15 1932

Document A101157