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Inside Room 40 - Gannon, Paul
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In August 1914, the German cruiser Magdeburg ran aground off the Estonian coast. Onboard the Magdeburg was a collection of cladestine codebook and maps, containing coded squares, which offered valuable clues as to the whereabouts of the German High Seas Fleet. This is the codebreakers who worked within the confines of Room 40.

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Inside Room 40 2011, Ian Allan Publishing

ISBN-13: 9780711034082

Hardcover