TY  - BOOK
AU  - Jenkins,Gerald
AU  - Bear,Magdalen
TI  - Codes and ciphers: clever devices for coding and decoding to cut out and make 
SN  - 1899618538
PY  - 2002///
CY  - Norfolk
PB  - Tarquin
KW  - Codes
KW  - sears
KW  - Mathematical recreations
KW  - Chipers
ER  -