Beissinger, Janet. <br/><br/>
The cryptoclub  using mathematics to make and break secret codes /  [electronic resource] : 
Janet Beissinger, Vera Pless. 
 - Wellesley, Mass. :  A K Peters,  c2006. 
 - xvi, 199 p. :  col. ill. ;  23 cm. 
<br/><br/> Includes index. 
<br/><br/><br/>Electronic reproduction. <br/>Palo Alto, Calif. : <br/>ebrary, <br/>2009. <br/>Available via World Wide Web. <br/>Access may be limited to ebrary affiliated libraries. 
<br/><br/><label>ISBN: </label>
<br/><br/><label>LCCN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Cryptography--Juvenile literature.<br/>Mathematics--Juvenile literature.
<br/><br/><label>Index Terms--Genre/Form: </label><br/>Electronic books.
<br/><br/><label>LC Class. No.: </label>QA40.5  / .B45 2006eb 
<br/><br/><label>Dewey Class. No.: </label>510