Bow, James.

Secret signs / by James Bow. - 32 pages : color illustrations ; 26 cm. - Mystery files . - Mystery files .

Includes bibliographical references(page 31) and index.

ISBN: 9780778711254 (reinforced library binding : alk. paper) 9780778711292 (pbk. : alk. paper)

LCCN: 2012049883

Subjects--Topical Terms:
Cryptography.
Ciphers.
Signs and symbols.

LC Class. No.: CB475 / .B69 2013