Thompson, Lisa, 1969-

Break that code / Lisa Thompson and Sharon Dlaleish. - Markham, ON : Scholastic Canada, c2004. - 32 p. : col. ill. ; 20 cm. - Brainwaves .

Includes index.

Use your skills to break some codes and learn how codes have been used since ancient times. And find out how breaking secret enemy codes actually helped to win wars.

ISBN: 0779139534

Subjects--Topical Terms:
Readers (Elementary)
Ciphers.
Signs and symbols.
Telegraph.

LC Class. No.: PE1117 / .B72 no.003