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• For file L1(C) on OVERLORD, see HW 40/6

  Held by

  The National Archives, Kew

  Date

  Reference

  HW 40/42

• Accessions administration: HW 40

  Held by

  The National Archives, Kew

  Date

  2000 Jan 1 - 2003 Dec 31

  Reference

  PRO 57/15770

• Appendix I Stockholm - see HW 15/40-42 for message texts

  Held by

  The National Archives, Kew

  Date

  1940-1948

  Reference

  HW 15/61/17

• Room 40: World War I official histories. Transferred to HW 3/180

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/13

• Room 40: World War I official histories. Transferred to HW 3/181

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/14

• Room 40: World War I official histories. Transferred to HW 3/176

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/9

• Room 40: World War I official histories. Transferred to HW 3/177

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/10

• Room 40: World War I official histories. Transferred to HW 3/179

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/12

• Room 40: World War I official histories. Transferred to HW 3/178

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/11

• Room 40: World War I official histories. Transferred to HW 3/182

  Held by

  The National Archives, Kew

  Date

  1914-1918

  Reference

  HW 7/15

• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• British - General: enemy exploitation of codes and cyphers

  Held by

  The National Archives, Kew

  Date

  1942 Aug 10 - 1948 Apr 22

  Reference

  HW 40/40

• Government Code and Cypher School: Security of Allied Cyphers Section: Security Files...

  Held by

  The National Archives, Kew

  Date

  1917-1979

  Reference

  HW 40

• 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

• Stockholm; 1. Mail sent to London with a Neighbour Stockholm; 2. Swedes reported...

  Held by

  The National Archives, Kew

  Date

  1941 Dec 12

  Reference

  HW 15/40/40

• Activities of the Japanese Military Y Service

  Held by

  The National Archives, Kew

  Date

  1941 Oct 27 - 1944 Dec 08

  Reference

  HW 40/201

• Reflections of enemy exploitation of Chinese Army WTI (wireless telegraphy intelligence)

  Held by

  The National Archives, Kew

  Date

  1944 Jun 22 - 1945 Jul 10

  Reference

  HW 40/226

• Other Allies - Intelligence (General): mostly reports

  Held by

  The National Archives, Kew

  Date

  1943 Apr 07 - 1945 Aug 11

  Reference

  HW 40/145

• Enemy exploitation of British Army WTI (wireless telegraphy intelligence): miscellaneous...

  Held by

  The National Archives, Kew

  Date

  1944 Feb 12 - 1945 Apr 04

  Reference

  HW 40/50

• German Y Service: miscellaneous papers, including a report on the interrogation of...

  Held by

  The National Archives, Kew

  Date

  1934 Jan 01 - 1949 Mar 09

  Reference

  HW 40/158