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All About Codes
written by Gail Blasser Riley 1st ed.. Steck-Vaughn, 2000 Book
Secret Codes
by Ken Beatty 1st ed.. Person, 2007 Book
Breaking the Code with Cryptography : Analyzing Patterns
Janey Levy 1st ed.. Rosen, 2006 Book
The Secret Life of Codes : It’s Maths with the Laughs Added in!
Kjartan Poskitt ; ill. by Philip Reeve 1st ed.. Scholastic, 2010 Book
