Enigma : codebreaking and the Second World War : the true story through contemporary documents / introduced and selected by Oliver Hoare. - Richmond : Public Record Office, 2002. - 1 portfolio ; 27 cm.

Portfolio includes: 1 booklet -- 16 facsimiles -- 1 poster. Cover title.

1903365406

bA2Z3860


Great Britain. Government Communications Headquarters.


World War, 1939-1945--Secret service--Great Britain.
World War, 1939-1945--Electronic intelligence--Great Britain.
World War, 1939-1945--Cryptography.--Great Britain
Cryptography.
Cryptography--History.



Hoare, Oliver.