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• Accessions administration: HW 37

  Held by

  The National Archives, Kew

  Date

  2000 Jan 1 - 2000 Dec 31

  Reference

  PRO 57/15768

• Appendix 4B Prague - see HW 15/37 for message texts

  Held by

  The National Archives, Kew

  Date

  1940-1948

  Reference

  HW 15/61/10

• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• Government Code and Cypher School: Diplomatic Section: Diplomatic Decrypts Passed...

  Held by

  The National Archives, Kew

  Date

  1935-1945

  Reference

  HW 37

• Naval Headlines: Italian activity and refit arrangements for submarines based at...

  Held by

  The National Archives, Kew

  Date

  1941 Aug 31

  Reference

  HW 1/37

• DSH 16 - Codes and Cyphers. Technical crypt matters

  Held by

  The National Archives, Kew

  Date

  1923 Jun 01 - 1945 Aug 31

  Reference

  HW 53/37

• Security of electronic communications

  Held by

  Creating government department or its successor

  Date

  1954 Feb-1954 Sept

  Reference

  HW 9/37

• Naval WTI (wireless telegraphy intelligence) - Far East

  Held by

  The National Archives, Kew

  Date

  1944 Dec 05 - 1945 Mar 27

  Reference

  HW 40/37

• Reports in the series QT/3001 to QT/3500.

  Held by

  The National Archives

  Date

  1942 Oct 07-1942 Oct 14

  Reference

  HW 20/37

• Commercial messages passed over diplomatic channels

  Held by

  The National Archives, Kew

  Date

  1945 Mar 01-1945 Mar 31

  Reference

  HW 32/37

• Italian Air Attach? in Tokyo continues to inform Rome on Japanese operations in the...

  Held by

  The National Archives, Kew

  Date

  1942 Jan 28-1942 Mar 21

  Reference

  HW 21/37

• Comintern courier and visa lists. (Described at item level). Note: that message serial...

  Held by

  The National Archives, Kew

  Date

  1932 Jan-1937 Dec

  Reference

  HW 17/37

• EWT order to Service Chiefs, with comments from HAS and AD (S) on handling of Ultra...

  Held by

  The National Archives, Kew

  Date

  1942 May 11-20

  Reference

  HW 14/37

• Decrypts of Japanese army and army air force messages

  Held by

  The National Archives, Kew

  Date

  1944 Aug 01-1945 Apr 15

  Reference

  HW 52/37

• Signals concerned with staffing at CBME

  Held by

  The National Archives, Kew

  Date

  1943 Jul 15 - 1943 Jul 23

  Reference

  HW 51/37

• GRU (Soviet Intelligence) Military Attaché Traffic: Moscow to Prague, Czechoslovakia....

  Held by

  The National Archives, Kew

  Date

  1940 Mar 1

  Reference

  HW 15/37

• 37369-38731

  Held by

  The National Archives, Kew

  Date

  1942 Sep 01-1942 Sep 15

  Reference

  HW 19/37

• German Naval Air Activity (GNA): Including air reconnaissance activities to locate...

  Held by

  The National Archives, Kew

  Date

  1943 Oct 1-1943 Dec 31

  Reference

  HW 13/37

• Photocopies of : 1. Letter from Major General Clayton Bissell, War Department, Washington,...

  Held by

  The National Archives, Kew

  Date

  1944 May 20-1944 Jul 03

  Reference

  HW 37/4

• Messages submitted to Director ["C", Head of MI6] September 1942-December 1943 Japanese...

  Held by

  The National Archives, Kew

  Date

  1942 Sep 15-1943 Dec 21

  Reference

  HW 37/2