Room 40
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 Admiralty Ripley building In Whitehall, built in 1726 and still used for naval board meetings. Room 40 was in the northern section of the first floor, on the same corridor as the boardroom and First Sea Lord's office. |
In the history of Cryptanalysis, Room 40 (latterly NID25) was the section in the Admiralty most identified with the British cryptoanalysis effort during the First World War.
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| The Papers of William Clarke The Papers of William Clarke janus.lib.cam.ac.uk/db/node.xsp?id=EAD%2FGBR%2F0014%2FCLKE - Web |
| The Papers of Alexander Denniston The Papers of Alexander Denniston janus.lib.cam.ac.uk/db/node.xsp?id=EAD%2FGBR%2F0014%2FDENN - Web |
| The Papers of William Reginald Hall The Papers of William Reginald Hall janus.lib.cam.ac.uk/db/node.xsp?id=EAD%2FGBR%2F0014%2FHALL - Web |
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| Original Documents from Room 40 Original Documents from Room 40 germannavalwarfare.info/indexbr.htm - Web |
