TY  - BOOK
AU  - Gaines,Helen Fouché
TI  - Cryptanalysis : : a study of ciphers and their solution 
SN  - 0486200973 (pbk.)
AV  - Z104 .G35 1956
U1  - 652.8 22
PY  - 1956///
CY  - New York
PB  - Dover Publications
KW  - Cryptography
KW  - Ciphers
N1  - includes index; "Unabridged and corrected edition of ... [the author's] Elementary cryptanalysis."
ER  -