Welsh, Dominic <br/><br/>
Codes and cryptography 
Dominic Welsh 
 - Oxford [Oxfordshire]  New York  Clarendon Press  Oxford University Press  1988 
 - ix, 257 p  25 cm 
<br/><br/> Cuprinde Index 
<br/><br/> Includes  
<br/><br/><br/>eng 
<br/><br/><label>ISBN: </label>0198532881 0198532873 (pbk.) 
<br/><br/><label>LCCN: </label>87031354 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers<br/>Cryptography
<br/><br/><label>Dewey Class. No.: </label>652.8 005.82