LEADER 00000nam 2200217 a 4500 001 0684831309 007 t 008 050321s1996 ny a r 001 eng 020 0684831309 040 CURLLC 050 4 Z 103 K1 100 1 Kahn, David,|d1930- 245 14 The codebreakers :|bthe story of secret writing. 246 1 |iThe|astory of secret writing 250 [Rev. and updated ed.]. 260 New York :|bScribner,|cc1996. 300 1181p. 650 0 Cryptography|xHistory.
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