Kimpton, Diana. <br/><br/>
Cracking Codes / 
Diana Kimpton ; illustrated by Mike Phillips. 
 - London :  Hippo,  2003. 
 - 158 p. :  ill. ;  20 cm. 
 - The knowledge .
<br/><br/> Formerly CIP. 
<br/><br/><label>ISBN: </label>0439981840 (pbk.) :  £4.99 
<br/><br/><label>Nat. Bib. No.: </label>GBA3V1837  bnb 
<br/><br/><label>Nat. Bib. Agency Control No.: </label>006890392  Uk 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Ciphers--Juvenile literature.<br/>Cryptography--Juvenile literature.
<br/><br/><label>Dewey Class. No.: </label>