TY  - GEN
AU  - Yardley,Herbert O.
TI  - The American black chamber / 
SN  - 1591149894
AV  - D639.S7  
U1  - 940.54/8673 |2 22 
PY  - 2004///]
CY  - Annapolis, Md. : 
PB  - Naval Institute Press
KW  - United States
KW  - History
KW  - World War 19141918
KW  - Secret service
KW  - Military intelligence
KW  - Cryptography
N1  - Originally published: Indianapolis : Bobbs-Merrill, 1931
ER  -