TY  - BOOK
AU  - Copeland, B Jack
TI  - Colossus : the secrets of Bletchley park's codebreaking computers
SN  - 9780199578146
U1  - 940.548641 COP 
PY  - 2010///
CY  - Oxford
KW  - Great Britain. -- Government Code and Cypher School -- History
KW  - Lorenz cipher system
KW  - World War, 1939-1945 -- Electronic intelligence -- Great Britain
ER  -