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Room 40

其他書名	German Naval Warfare 1914-1918: Volume I: The Fleet in Action
出版	CreateSpace Independent Publishing Platform, 2016-06-21
主題	History / Europe / Great Britain / General
ISBN	15348224969781534822498
URL	http://books.google.com.hk/books?id=RcCnzwEACAAJ&hl=&source=gbs_api

註釋A top secret intelligence analysis written 1919-1920 by the members of Room 40, the British deciphering unit in the Admiralty, never published before. It's a history of the decryption of German naval and diplomatic messages in World War I, about German Uboat warfare and High Sea Fleet actions including the Battle of Jutland 1916.