TY  - BOOK
AU  - Helen Fouché Gaines
TI  - Cryptanalysis; a study of ciphers and their solution
SN  - 9780486200972
U1  - 652 
PY  - 1956///
CY  - New York, 
PB  - Dover Publications 
KW  - Cryptography
KW  - Ciphers
ER  -