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• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• Government Code and Cypher School: Bulgarian River Navigation and Port Authorities...

  Held by

  The National Archives, Kew

  Date

  1944-1945

  Reference

  HW 70

• Bulgarian messages concerned with shipping problems on the Danube and in the Aegean...

  Held by

  The National Archives, Kew

  Date

  1944 May 01 - 1945 Aug 23

  Reference

  HW 70/1

• Signals from the British naval base at Alexandria concerned with enemy communications

  Held by

  The National Archives, Kew

  Date

  1943 Jul 07-1943 Dec 07

  Reference

  HW 41/70

• Reply from GHQ Int (s) Mar 12 to EWT's letter of Mar 3 on GCCS liaison with GHQ and...

  Held by

  The National Archives, Kew

  Date

  1943 Mar 11-20

  Reference

  HW 14/70

• Decrypts of Japanese army and army air force messages

  Held by

  The National Archives, Kew

  Date

  1945 Jun 10-1945 Aug 10

  Reference

  HW 52/70

• Analysis of callsign usage by German military units

  Held by

  The National Archives, Kew

  Date

  1942 Sep 16 - 1944 Mar 29

  Reference

  HW 51/70

• Staffing and conditions of work at Bletchley Park

  Held by

  The National Archives, Kew

  Date

  1942 May 30 - 1943 Oct 31

  Reference

  HW 64/70

• Decrypts of intercepted diplomatic communications. Afghanistan: 20309, 20391, 20449,...

  Held by

  The National Archives, Kew

  Date

  1925 May

  Reference

  HW 12/70

• Commercial reports

  Held by

  The National Archives, Kew

  Date

  1940 Dec 10-1940 Dec 20

  Reference

  HW 29/70

• GCCS temporary male telegraphists' pay

  Held by

  The National Archives, Kew

  Date

  1939

  Reference

  HW 3/70

• German section: reports of German army and air force high grade machine decrypts

  Held by

  The National Archives, Kew

  Date

  Mar 6 1942-Mar 9 1942

  Reference

  HW 5/70

• Italian air activity including daily summaries 1 - 180 (second series).

  Held by

  The National Archives, Kew

  Date

  1943 Jan 31-1943 July 30

  Reference

  HW 21/70

• Decrypts of medium/low grade German naval cypher messages

  Held by

  The National Archives, Kew

  Date

  1942 Oct 12-1942 Dec 02

  Reference

  HW 18/70

• Fighter Command

  Held by

  The National Archives, Kew

  Date

  1940 Nov 12-1942 May 25

  Reference

  HW 2/70

• Signals from D.D.I.C [Deputy Director Operational Intelligence Centre, Admiralty]...

  Held by

  The National Archives, Kew

  Date

  1941 Apr 27-1941 Oct 12

  Reference

  HW 8/70

• 82003-83483

  Held by

  The National Archives, Kew

  Date

  1944 Jun 18-1944 Jul 17

  Reference

  HW 19/70

• GPS Advanced Text (AT) reporting series supporting GPD and GPDD series reports

  Held by

  The National Archives, Kew

  Date

  1944 June - 1945 Mar

  Reference

  HW 16/70

• Comintern messages: Communist Party, LONDON and BERLIN; Communist Party, LONDON and...

  Held by

  The National Archives, Kew

  Date

  1931 Apr 22-1932 May 19

  Reference

  HW 17/70

• 1st Panzer Group sitrep Sept 15: 14th Panzer Division repulsed Soviet attack on east...

  Held by

  The National Archives, Kew

  Date

  1941 Sept 16

  Reference

  HW 1/70