TY  - BOOK
AU  - Miller, Marvin
TI  - Codemaster. book #1 : how to write and decode secret messages
SN  - 9780590373869
SN  - 99481160
U1  - 793.73 MIL 
PY  - 1998///
CY  - New York
PB  - Scholastic
KW  - Athletic & outdoor sports & games
KW  - Ciphers - Juvenile literature
KW  - Cryptography - Juvenile literature
N1  - These codes were previously published in Boy's Life magazine. Reading level 4 ; ages 9 to 12
ER  -