Code making, code breaking

PLATT, Richard

LAWRIE, Robin

Series: Collins big cat. Emerald band 15
Notes
47 p. : col. ill. "An information book"--Back cover. Collins big cat. Emerald band 15.
9 years
Custom 1
Literacy
Custom 2
White box - Big Cat -Collins
Location edition Bar Code due date
Senior Reading Room SRB3372
Dewey:652
call #:PLA
ISBN:9780007336449
pub:2011
Subjects
Codes and ciphers.
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