Puzzler code crackers : over 200 new code cracking puzzles from the UK's leading puzzle publisher 
Carlton 
 - London  Carlton Books  2007 
 - 256 p. : 20 cm 
<br/><br/><label>ISBN: </label>9781844425822 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Puzzles
<br/><br/><label>Dewey Class. No.: </label>793.73 CAR