00672cam a2200229 4500 62117636 TxAuBib 20010730120000.0 010730s1995||||||||||||||||||||||||eng|u 94030019 9780803717251 0803717253 DLC DLC DLC TxAuBib Huckle, Helen. The secret code book / Helen Huckle. 1st ed. New York : Dial Books, 1995. 57 p. : ill. (some col.) ; 20 cm. Includes 1 page of code wheels. 20010730. Cryptography. Juvenile literature.