TY  - BOOK
AU  - Mollin, Richard A.
TI  - Codes: : the guide to secrecy from ancient to modern times 
T2  - Discrete Mathematics and its applications
SN  - 1584884703
U1  - 518.11 
PY  - 2005///
CY  - Boca Raton
PB  - Chapman & Hall/CRC Press
N1  - "Purchased under NBHM grant for the year 2005-2006"
ER  -