TY  - BOOK
AU  - Gaines, Helen Fouche'.
TI  - Cryptanalysis : : a study of ciphers and their solution
AV  - 57203 
U1  - 652.8 
PY  - 1956///
CY  - New York : 
PB  - Dover Publications, Inc., 
KW  - Cryptography
KW  - Ciphers
N1  - Includes appendices
ER  -