TY  - BOOK
TI  - Secret Codes / 
T2  - let,s investigate
SN  - 071050991x
U1  - J/ 652.8 
PY  - 1997///
CY  - bridlington
PB  - peter haddock
KW  - CRYPTOGRAPHY
KW  - ÙØ§Ø´Ø¦ÙÙ ØµØºØ§Ø± (10-14 Ø³ÙØ©)
ER  -