TY  - BOOK
AU  - CLARK, Ronald W author
AU  - Friedman, William F.
TI  - The man who broke purple: the life of the world's gratest cryptologist, Colonel William F.Friedman
SN  - 0297772791
PY  - 1977///
CY  - London
PB  - Weidenfield and Nicolson
KW  - Cryptography
ER  -