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• German naval communications

  Held by

  The National Archives, Kew

  Date

  1945 Feb 01-1945 Jun 06

  Reference

  HW 18/163

• Information on the communications of the German, Spanish and French navies

  Held by

  The National Archives, Kew

  Date

  1944 May 05-1945 Sep 13

  Reference

  HW 18/39

• Criticisms of GC&CS Notes with source references on external and internal criticism...

  Held by

  The National Archives, Kew

  Date

  1939 Dec 16 - 1947 Feb 22

  Reference

  HW 50/18

• Military Cryptanalysis (German) - Early historical notes. A P Mahon's manuscript...

  Held by

  The National Archives, Kew

  Date

  1920 Jan 01-1945 Dec 31

  Reference

  HW 25/18

• W.T.I. interpretation Reports passed to the Admiralty which contained interpretation...

  Held by

  The National Archives, Kew

  Date

  1941 Apr 03-1941 May 31

  Reference

  HW 18/185

• Summaries of German and Italian decrypts concerning radar

  Held by

  The National Archives, Kew

  Date

  1944 Feb 02-1945 Jan 24

  Reference

  HW 18/233

• Intelligence memorandum on the Japanese naval telecommunications organisation. Pages...

  Held by

  The National Archives, Kew

  Date

  1944 Jun 23-1944 Jun 23

  Reference

  HW 18/214

• French naval messages Continuation of ZIP/T.F.N series

  Held by

  The National Archives, Kew

  Date

  1942 Mar 11-1943 May 22

  Reference

  HW 18/154

• W/Tactivity charts Series of charts which accompanied the naval traffic analysis...

  Held by

  The National Archives, Kew

  Date

  1940 May 28-1940 Nov 30

  Reference

  HW 18/181

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1944 Jun 01-1945 May 05

  Reference

  HW 18/402

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1943 Jun 01-1944 May 31

  Reference

  HW 18/364

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1944 Nov 01-1945 May 07

  Reference

  HW 18/417

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1942 May 01-1943 Jul 31

  Reference

  HW 18/342

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1943 Dec 01-1945 May 30

  Reference

  HW 18/380

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1944 Mar 01-1945 Apr 30

  Reference

  HW 18/390

• Commercial messages concerning Japanese shipping and cargoes

  Held by

  The National Archives, Kew

  Date

  1945 Oct 02-1945 Oct 30

  Reference

  HW 30/18

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1944 Aug 01-1945 May 04

  Reference

  HW 18/409

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1944 May 01-1944 May 05

  Reference

  HW 18/399

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1943 Nov 01-1945 Apr 30

  Reference

  HW 18/379

• Extracts from reports containing information about the activity of German U-boats:...

  Held by

  The National Archives, Kew

  Date

  1941 Sep 01-1943 Feb 28

  Reference

  HW 18/317