D'Agapeyeff, Alexander. <br/><br/>
Codes and ciphers / 
Alexander d'Agapeyeff 
 - Rev. and reset 
 - London :  G. Cumberlege, Oxford university press,  1952. 
 - 149 p. :  ill. ;  19 cm 
 -  1 Compass books ; .
<br/><br/>Bibliography: p. 145-146. and index. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers<br/>Cryptography
<br/><br/><label>Dewey Class. No.: </label>652.8  / DAC 1952