Miller, Marvin <br/><br/>
Codemaster. book #1 : how to write and decode secret messages 
by Marvin Miller 
 - New York  Scholastic  c1998 
 - 69 p. : ill. ; 20 cm 
<br/><br/> These codes were previously published in Boy's Life magazine. Reading level 4 ; ages 9 to 12 
<br/><br/><label>ISBN: </label>9780590373869 
<br/><br/><label>ISSN: </label>99481160 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Athletic & outdoor sports & games<br/>Ciphers - Juvenile literature<br/>Cryptography - Juvenile literature
<br/><br/><label>Dewey Class. No.: </label>793.73 MIL