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• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• Government Code and Cypher School: Liaison with Signals Intelligence Organisations...

  Held by

  The National Archives, Kew

  Date

  1941-1946

  Reference

  HW 57

• Co-operation with the US Army Sigint Organisation based at Arlington Hall, Washington

  Held by

  The National Archives, Kew

  Date

  1943 Jan 01 - 1943 Dec 31

  Reference

  HW 57/29

• MEW [Ministry of Economic Warfare] Liaison. Berkeley Street correspondence with MEW

  Held by

  The National Archives, Kew

  Date

  1943 Sep 23 - 1944 Sep 01

  Reference

  HW 53/57

• British-Canadian-USA signals intelligence liaison including meeting held in April...

  Held by

  The National Archives, Kew

  Date

  1942 Apr 01 - 1942 Oct 31

  Reference

  HW 57/12

• Monthly letters from Colonel O'Connor (GC&CS representative in Washington) to the...

  Held by

  The National Archives, Kew

  Date

  1945 Jan 01 - 1945 Jul 31

  Reference

  HW 57/5

• United States signals intelligence boards and committee

  Held by

  The National Archives, Kew

  Date

  1942 Sep 11 - 1943 Mar 31

  Reference

  HW 57/17

• Exchange of European cryptographic information between Bletchley Park and the Signal...

  Held by

  The National Archives, Kew

  Date

  1943 Jan 25 - 1945 Aug 30

  Reference

  HW 57/1

• Paper presented by Captain Sandwith RN on British radio intelligence at a joint US-British-Canadian...

  Held by

  The National Archives, Kew

  Date

  1942 Apr 06

  Reference

  HW 57/14

• Water supplies at Bletchley Park

  Held by

  The National Archives, Kew

  Date

  1942 Feb 03 - 1944 Nov 20

  Reference

  HW 64/57

• British Y Committee co-operation with its American counterpart

  Held by

  The National Archives, Kew

  Date

  1942 Jul 01 - 1942 Aug 31

  Reference

  HW 57/20

• Signals passed between signals intelligence authorities in USA, UK and the US mission...

  Held by

  The National Archives, Kew

  Date

  1944 Apr 27 - 1945 Aug 15

  Reference

  HW 57/33

• Technical report on visit of inter-service Y mission to USA and Canada

  Held by

  The National Archives, Kew

  Date

  1942 Mar 01 - 1942 Jun 30

  Reference

  HW 57/13

• Albanian Directorate of Security messages including activity on Albanian/Greek and...

  Held by

  The National Archives, Kew

  Date

  1949 Feb 23 - 1949 Apr 20

  Reference

  HW 75/57

• Reports in the series QT/9751 to QT/9999.

  Held by

  The National Archives

  Date

  1942 Dec 28-1942 Dec 31

  Reference

  HW 20/57

• General Intelligence (Japanese): The Current Party by Lieut. Cdr. S.G. Putt, R.N.V.R....

  Held by

  The National Archives, Kew

  Date

  1942 Aug 01-1945 Sep 24

  Reference

  HW 8/57

• Secret Writing messages. (Described at item level)

  Held by

  The National Archives, Kew

  Date

  1941 Nov 17-1943 Sept 29

  Reference

  HW 15/57

• Investigation into success or otherwise of Japanese efforts against allied cyphers...

  Held by

  The National Archives, Kew

  Date

  1945 Nov 06 - 1945 Nov 30

  Reference

  HW 57/18

• Appointment of RAF officer as MOD's representative at Arlington Hall, Washington

  Held by

  The National Archives, Kew

  Date

  1943 Nov 15 - 1943 Nov 30

  Reference

  HW 57/19

• Reports on visits by Major Haigh, Colonel Tiltman and Colonel Maltby to North America

  Held by

  The National Archives, Kew

  Date

  1942 Mar 01 - 1943 Apr 30

  Reference

  HW 57/24