The Mammoth Book of Secret Code Puzzles (Mammoth Books) by Elonka Dunin (27 Apr 2006)
The Mammoth Book of Secret Codes and Cryptograms: Over 600 Mystery Codes to be Cracked! by Elonka Dunin (22 Mar 2006)
Secrets of the Lost Symbol: The Unauthorized Guide to the Mysteries Behind the Da Vinci Code Sequel by Daniel Burstein, Arne de Keijzer and David A. Shugarts (19 Oct 2010)
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