The Bletchley Park codebreakers / How Ultra shortened the war and led to the birth of the computer edited by Ralph Erskine & Michael Smith. - [Updated ed.]. - London : Biteback, c2011. - xvi, 495 p., [8] p. of plates : ill., facsims., ports. ; 20 cm.

"Originally published as 'Action this day: from the breaking of the Enigma Code to the birth of the modern computer'--Bantam Press, 2001 (This edition is updated with a new chapter and additional material)".

Includes bibliographical references (p. 410-470) and index.

1849540780 (pbk.) 9781849540780 (pbk.)

Great Britain. Government Communications Headquarters.

World War, 1939-1945--Electronic intelligence--Great Britain.
World War, 1939-1945--Secret service--Great Britain.
World War, 1939-1945--Cryptography.
World War, 1939-1945--England--Bletchley (Buckinghamshire).

Bletchley (Buckinghamshire, England)--History--20th century.

D810.C88 / A28 2011

Smith, Michael, --1952 May 1-Erskine, Ralph.