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Lu & Clancy's secret codes /
by Mason, Adrienne.
Publication:
Toronto : Kids Can Press, 1999
. 40 p. :
26 cm.
Date:1999
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Ultra hush-hush : espionage and special missions /
by Shapiro, Stephen,
Publication:
Toronto : Annick Press, 2003
. 96 p. :
, Includes index.
28 cm.
Date:2003
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Mensa presents secret codes for kids /
by Allen, Robert.
Publication:
[London, Eng.] : Carlton, 1996
. 128 p. :
29 cm.
Date:1996
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The 39 Clues: The medusa plot /
by Korman, Gordon.
Publication:
New York : Scholastic, 2011
. 222 p. :
20 cm.
Date:2011
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Codes and ciphers /
by Gilbert, Adrian.
Publication:
Buffalo : Firefly Books, 2008
. 32 p. :
, Includes index.
Date:2008
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(1),
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