Moore, Dan Tyler <br/><br/>
Cloak and cipher / 
Dan Tyler Moore, Martha Waller 
 - London :  George G. Harrap,  1965 
 - 227 p. :  ill. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography
<br/><br/><label>Dewey Class. No.: </label>358.24