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1.
Mysterious messages : a history of codes and ciphers Gary Blackwood ; designed and illustrated by Jason Henry by
Material type: Text Text
Language: English
Publication details: New York Scholastic 2010, c2009
Availability: Items available for loan: DIS Library (1)Call number: F Blackwo.

2.
Cracking Codes / Diana Kimpton ; illustrated by Mike Phillips. by Series:
Material type: Text Text
Publication details: London : Hippo, 2003
Availability: Items available for loan: DIS Library (1)Call number: 652.8 K impton.

3.
The 39 clues : the black circle Patrick Carman by Series: The 39 clues ; no.5
Material type: Text Text
Publication details: New York Scholastic 2009
Availability: Items available for loan: DIS Library (1)Call number: F Carman no.5.

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