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Mason, Adrienne.
Lu & Clancy's secret codes / Lu and Clancy's secret codes written by Adrienne Mason ; illustrated by Pat Cupples. - Toronto : Kids Can Press, c1999. - 40 p. : col. ill. ; 26 cm. - Lu & Clancy .
ISBN:
1550745530 : $5.95
Subjects--Topical Terms:
Cryptography.
Ciphers.
Dewey Class. No.:
j652.8