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• Appendix 7 Washington (formerly Appendix G) - see HW 15/49 for message texts

  Held by

  The National Archives, Kew

  Date

  1940-1948

  Reference

  HW 15/61/15

• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• German code book 13040, used inter alia for encoding Zimmerman message. Transferred...

  Held by

  The National Archives, Kew

  Date

  1916-1917

  Reference

  HW 3/176

• Associated press items and official announcements from Germany, US, Mexico and Japan....

  Held by

  The National Archives, Kew

  Date

  1917 Mar

  Reference

  HW 3/180

• Exchanges between Admiralty and British Naval Attaché Washington on events related...

  Held by

  The National Archives, Kew

  Date

  1917 Feb-Mar

  Reference

  HW 3/178

• Records of WF Clarke of Room 40 and Head of Naval Section, Government Code and Cypher...

  Held by

  The National Archives, Kew

  Date

  1925-1927

  Reference

  HW 3/182

• Room 40 and successors: World War I Official Histories

  Held by

  The National Archives, Kew

  Date

  [c1910]-1923

  Reference

  HW 7

• Room 40 German decrypts: diplomatic telegrams between Berlin and Mexico routed via...

  Held by

  The National Archives, Kew

  Date

  1916

  Reference

  HW 7/7

• German Army and Navy monitor diplomatic communications and prove German Foreign Office...

  Held by

  The National Archives, Kew

  Date

  1917 Mar-Aug

  Reference

  HW 3/181

• US diplomatic telegrams between London and Washington related to Zimmerman message...

  Held by

  The National Archives, Kew

  Date

  1917 Feb-Apr

  Reference

  HW 3/179

• Liaison between German Air Force and German Navy

  Held by

  The National Archives, Kew

  Date

  [1938 Oct 21-1939 Jan 10]

  Reference

  HW 21/7/7

• Germany 'Y' Organisation Listening Posts. Translation of a German manual. 'Scarlet...

  Held by

  The National Archives, Kew

  Date

  1934 Jan 01 - 1935 Dec 31

  Reference

  HW 73/7

• GC&CS Secret Service Sigint Volume II: Cryptographic Systems and their Solution....

  Held by

  The National Archives, Kew

  Date

  1939 Sep 01 - 1945 Aug 30

  Reference

  HW 43/7

• Selected folios from registry file including: GCHQ London signal detailing armed...

  Held by

  The National Archives, Kew

  Date

  1962 Dec 10 - 1963 Aug 22

  Reference

  HW 92/7

• Reports in the series MK/1001 to MK/1500.

  Held by

  The National Archives

  Date

  1941 Dec 18-1942 Jan 01

  Reference

  HW 20/7

• Admiralty or War Cabinet intelligence papers: Austria's peace terms; general peace...

  Held by

  The National Archives, Kew

  Date

  [c 1918]

  Reference

  HW 7/18

• Reports on Japanese military activity and organisation in South East Asia and India

  Held by

  The National Archives, Kew

  Date

  1944 Mar 17-1944 Nov 06

  Reference

  HW 46/7

• Co-operation between allied signal intelligence authorities and the French

  Held by

  The National Archives, Kew

  Date

  1942 Jan 01 - 1945 Mar 31

  Reference

  HW 61/7

• Security South Africa. 'Y' [Sigint] Board file reflecting security reservations about...

  Held by

  The National Archives, Kew

  Date

  1943 May 27 - 1943 May 28

  Reference

  HW 69/7

• Japanese communcations: messages and reports concerned with intercept, analysis and...

  Held by

  The National Archives, Kew

  Date

  1944 Jan 01 - 1944 Mar 31

  Reference

  HW 67/7