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LU & CLANCY'S SECRET CODES
by MASON, ADRIENNE
Publication:
TORONTO KIDS CAN PRESS 1999
. 40p
Date:1999
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(1),
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Codes and codebreaking /
by Langley, Andrew.
Publication:
Mankato, MN : Smart Apple Media, 2010
. 32 p. :
, Includes index.
30 cm.
Date:2010
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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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Secret signs /
by Bow, James.
Publication:
. 32 pages :
26 cm.
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(1),
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