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Cryptanalysis of the Double Transposition Cipher

Cryptanalysis of Shift-Register Generated Stream Cipher Systems

The History of Codes and Ciphers in the U. S. During the Period Between the World Wars PT. I

Cryptograms in Spanish

Cryptanalysis of an Enciphered Code Problem

Cryptanalysis of the Hagelin Cryptograph

Cryptograms, One Hundred Ten Cryptograms to Be Solved