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• General records of the Government Code and Cypher School

  Held by

  Date

  1914-1979

  Reference

• Government Code and Cypher School: Air Section: Reports on Italian and Other Foreign...

  Held by

  The National Archives, Kew

  Date

  1936-1944

  Reference

  HW 21

• Italian Air Force Orders of Battle.

  Held by

  The National Archives, Kew

  Date

  1940 Jan 1-1943 Dec 31

  Reference

  HW 21/21

• New York: STUKACh.

  Held by

  The National Archives, Kew

  Date

  1943 Oct 16

  Reference

  HW 15/21/21

• Note on Italian naval communications

  Held by

  The National Archives, Kew

  Date

  1939 Jun 30

  Reference

  HW 62/21/21

• Technical Sub-committee of the Y Committee papers. This sub-committee, which was...

  Held by

  The National Archives, Kew

  Date

  1941 Jan 03-1941 Jun 27

  Reference

  HW 42/21

• GC&CS Naval Sigint Volume XI: The Processing of Decrypts by W G Ettinghausen and...

  Held by

  The National Archives, Kew

  Date

  1939 Sep 01 - 1945 Aug 30

  Reference

  HW 43/21

• Reports in the series MK/8001 to MK/8500. Number MK/8058 not taken up

  Held by

  The National Archives

  Date

  1942 Jul 02-1942 Jul 08

  Reference

  HW 20/21

• MGB (Soviet Ministry of State Security) Traffic: Moscow from New York, USA. (Described...

  Held by

  The National Archives, Kew

  Date

  1943 Aug 10-1944 Apr 29

  Reference

  HW 15/21

• Intelligence reports on foreign air forces. (Described at item level)

  Held by

  The National Archives, Kew

  Date

  1936 Dec 15-1937 July 14

  Reference

  HW 21/2

• Security of electronic communications

  Held by

  Creating government department or its successor

  Date

  1956 Feb-1964 Jun

  Reference

  HW 9/21

• FRUEF/GEN. HMS Anderson: Japanese naval shore based units and defences

  Held by

  The National Archives, Kew

  Date

  1945 May 16-July 31

  Reference

  HW 4/21

• Commercial reports

  Held by

  The National Archives, Kew

  Date

  1940 Mar 28-1940 Mar 30

  Reference

  HW 29/21

• German and Italian reaction to Allied Malta convoy

  Held by

  The National Archives, Kew

  Date

  1941 June

  Reference

  HW 3/21

• Organisation and disposition of Spanish, Portuguese and French naval forces Spanish:...

  Held by

  The National Archives, Kew

  Date

  1942 Nov 01-1944 Sep 30

  Reference

  HW 22/21

• Provision of radio equipment by the RSS to the Polish station at Stanmore, Middlesex....

  Held by

  The National Archives, Kew

  Date

  1943 Sep 11-1943 Oct 23

  Reference

  HW 34/21

• Italian air summaries: general correspondence with Cairo.

  Held by

  The National Archives, Kew

  Date

  1943 Apr 16-1943 Aug 24

  Reference

  HW 21/76

• Intelligence reports on foreign air forces. (Described at item level)

  Held by

  The National Archives, Kew

  Date

  1940 June 5-1940 Aug 1

  Reference

  HW 21/19

• Reporters' glossary of Italian air terms

  Held by

  The National Archives, Kew

  Date

  [c 1936-c 1944]

  Reference

  HW 21/85

• Italian air activity including daily summaries 297 - 354.

  Held by

  The National Archives, Kew

  Date

  1942 July 15-1942 Sept 10

  Reference

  HW 21/67