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• Accessions administration: HW 25

  Held by

  The National Archives, Kew

  Date

  1999 Jan 1 - 2004 Dec 31

  Reference

  PRO 57/15756

• R883860 TOOTELL HW 25/10/1952 MANCHESTER

  Held by

  The National Archives, Kew

  Date

  1913 - 1972

  Reference

  BT 372/2876/80

• See HW 15/25 1944 Aug 23

  Held by

  The National Archives, Kew

  Date

  1944 Dec 28

  Reference

  HW 15/27/85

• Name: HW Brown. Service number: 5783898/1. Date of birth: 25 September 1922.

  Held by

  The National Archives, Kew

  Date

  [1939-1963]

  Reference

  WO 423/670377

• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• War Office translations of two papers entitled 'ENIGMA Enciphering Machine' and 'Typewriting...

  Held by

  The National Archives, Kew

  Date

  Reference

  HW 25/25

• Government Code and Cypher School: Cryptographic Studies

  Held by

  The National Archives, Kew

  Date

  1920-1978

  Reference

  HW 25

• New York. See May 31

  Held by

  The National Archives, Kew

  Date

  1944 Aug 12

  Reference

  HW 15/25/25

• Military Cryptanalysis (German) - Early historical notes. A P Mahon's manuscript...

  Held by

  The National Archives, Kew

  Date

  1920 Jan 01-1945 Dec 31

  Reference

  HW 25/18

• Letter from Cdr Travis to Nigel de Grey, recounting his recollections of the search...

  Held by

  The National Archives, Kew

  Date

  1941 Jan 01 - 1950 Jan 17

  Reference

  HW 25/32

• Major Curtis of Hut 3 makes further attempt to play a greater role, suggests he runs...

  Held by

  The National Archives, Kew

  Date

  1941 Dec 16-31

  Reference

  HW 14/25

• Bombe Register II, which had been on loan to the Historical section.Continuation...

  Held by

  The National Archives, Kew

  Date

  1940 Jan 01-1945 Dec 31

  Reference

  HW 25/20

• Mathematical theory of ENIGMA machine by Alan Mathison Turing. (1) Also known as...

  Held by

  The National Archives, Kew

  Date

  1939 Jan 01 - 1942 Dec 31

  Reference

  HW 25/3

• Reports in the series MKA/1 to MKA/500. Number MKA/185 not taken up

  Held by

  The National Archives

  Date

  1942 Jul 23-1942 Jul 29

  Reference

  HW 20/25

• ALAN TURING WARTIME RESEARCH PAPERS RELEASED BY GCHQ'The Applications of Probability...

  Held by

  The National Archives, Kew

  Date

  1945 Jan 01 - 1946 Dec 31

  Reference

  HW 25/37

• ALAN TURING WARTIME RESEARCH PAPERS RELEASED BY GCHQ'Paper on Statistics of Repetitions'...

  Held by

  The National Archives, Kew

  Date

  1945 Jan 01 - 1946 Dec 31

  Reference

  HW 25/38

• Report on the British Y Service by Captain Brown of the US Signal Corps

  Held by

  The National Archives, Kew

  Date

  1942 Jan 01 - 1942 Aug 31

  Reference

  HW 57/25

• South Africa Y organisation

  Held by

  The National Archives, Kew

  Date

  1943 Feb 23 - 1944 Jul 03

  Reference

  HW 61/25

• GC&CS Naval Sigint Volume XV: Contents, Sources and General Index

  Held by

  Creating government department or its successor

  Date

  1939 Sep 01 - 1945 Aug 30

  Reference

  HW 43/25

• Office inventories of documents and working aids throughout GCCS at BP

  Held by

  The National Archives, Kew

  Date

  1941

  Reference

  HW 3/25