Arthur Johnson Memorial Library

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1. Codes, ciphers and secret writing. by Gardner, Martin frey50 Publication: New York Simon & Schuster 1972 . pg. 96 , Includes reference Date: 1972 Availability: Items available: Book Cart [j652 Gar] (1),
2. Codes and ciphers by Ashton, Christina Publication: Cincinnati, Ohio Betterway Books 1993 . pg. 110 , Includes index and appendices Date: 1993 Availability: Items available: [j652.8 Ash] (1),
3. Code breakers by Adams, Simon Publication: New York, NY : DK Publishing, 2002 . 96 p. : , "A Dorling Kindersley book." | "Includes top websites"--Cover. 20 cm. Date: 2002 Availability: Items available: [j652.8 Ada] (1),
4. The Bletchley circle by 20160731 frey50 Publication: [United States] : PBS Distribution, 2013 . 1 videodisc (135 min.) : , Originally broadcast as single episodes of a television program. | Special features: interviews with cast and crew. 4 3/4 in. Date: 2013 Availability: