TY  - BOOK
AU  - Apps, Roy
TI  - The top secret history of codes and codebreaking
SN  - 9780750298841
U1  - 652.8 23
PY  - 2018///
CY  - London
PB  - Wayland
KW  - Code breaking
KW  - Ciphers
KW  - Juvenile literature
ER  -