Wrixon Fred B <br/><br/>
Codes, ciphers, and secret languages / 
Fred B. Wrixon. 
 - New York :  Distributed by Crown publishers,  1989. 
 - 266 p. :  ill. ;  24 cm. 
<br/><br/>Bibliography: p. 265-266. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers--History<br/>Cryptography--History
<br/><br/><label>LC Class. No.: </label>Z103 
<br/><br/><label>Dewey Class. No.: </label>652/.8