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• Accessions administration: HW 41

  Held by

  The National Archives, Kew

  Date

  2001 Jan 1 - 2003 Dec 31

  Reference

  PRO 57/15771

• History of Wireless Experimental Centre (W.E.C) Delhi, June 1942-November 1945 (duplicate...

  Held by

  The National Archives, Kew

  Date

  1946 Mar 31

  Reference

  HW 41/121

• HW 41: Government Code and Cypher School: Services Field Signals Intelligence Units;...

  Held by

  The National Archives, Kew

  Date

  2001 Jan 1 - 2001 Dec 31

  Reference

  PRO 57/12580

• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• RAF Middle East monthly reports of Italian air force W/T activity

  Held by

  The National Archives, Kew

  Date

  1942 Aug 01-1943 Dec 31

  Reference

  HW 41/41

• Government Code and Cypher School: Services Field Signals Intelligence Units: Reports...

  Held by

  The National Archives, Kew

  Date

  1914-1977

  Reference

  HW 41

• Stockholm; Information from SMID.

  Held by

  The National Archives, Kew

  Date

  1942 Apr 12

  Reference

  HW 15/41/41

• Reports of Japanese naval air decrypts

  Held by

  The National Archives, Kew

  Date

  1945 May 19-1945 Jul 17

  Reference

  HW 27/41

• Radio countermeasures (RCM)

  Held by

  The National Archives, Kew

  Date

  1944 Jul 01 - 1944 Oct 31

  Reference

  HW 41/402

• Notes on the organisation of signals intelligence in South East Asia

  Held by

  The National Archives, Kew

  Date

  1944 Nov 16 - 1944 Dec 03

  Reference

  HW 41/428

• Reception of German medium frequency transmissions in the Middle East

  Held by

  The National Archives, Kew

  Date

  1941 May 01 - 1945 Oct 30

  Reference

  HW 41/427

• Historical review of Y work on German naval wireless telegraphy (W/T) communications

  Held by

  The National Archives, Kew

  Date

  1914 Jan 01 - 1945 Jul 31

  Reference

  HW 41/405

• Manual of Military Intelligence in the Field: Pamphlet No 5, 1939. Manual on conduct...

  Held by

  The National Archives, Kew

  Date

  1939 Jan 01 - 1939 Dec 31

  Reference

  HW 50/41

• Memoranda and minutes of the Y Board and Y Committee concerned with the expansion...

  Held by

  The National Archives, Kew

  Date

  1942 Jan 01 - 1943 Sep 21

  Reference

  HW 41/381

• Technical aspects of DF operations

  Held by

  The National Archives, Kew

  Date

  1944 Nov 07 - 1945 Sep 26

  Reference

  HW 41/394

• Western Mediterranean signals intelligence reports

  Held by

  The National Archives, Kew

  Date

  1944 Apr 01 - 1944 Dec 31

  Reference

  HW 41/372

• Report describing the frequency spectrum between 20 and 3000 megacycles for the use...

  Held by

  The National Archives, Kew

  Date

  1945 Mar 01-1945 Mar 01

  Reference

  HW 41/132

• Reports of activities of Intelligence units in North Africa

  Held by

  The National Archives, Kew

  Date

  1941 Oct 01 - 1942 Jan 31

  Reference

  HW 41/430

• Information on German, Italian and French communications passed to naval intercept...

  Held by

  The National Archives, Kew

  Date

  1938 Apr 15-1940 Feb 12

  Reference

  HW 41/136

• Organisation of signals intelligence in the Far East

  Held by

  The National Archives, Kew

  Date

  1944 Oct 24 - 1945 May 17

  Reference

  HW 41/418