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  E-mail Message: I thought you might be interested in this item at http://www.worldcat.org/oclc/10725923 Title: Codes, ciphers, and secret writing Author: Martin Gardner Publisher: New York : Dover, 1984, ©1972. ISBN/ISSN: 0486247619 : 9780486247618 OCLC:10725923

  
  

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Codes, ciphers, and secret writing