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40 O.B. Or How the War was Won [1932, British Naval Intelligence]
Digitised by Google Books from the collection at the University of Michigan https://books.google.com/books?id=foUCAAAAMAAJ Ninth Edition 1932. A 1935 newspaper article reporting the death of the author Hugh Cleland Hoy indicates that the book was published in September 1932 with some text alterations as required by the Admiralty, see https://www.findmypast.co.uk/image-share/59961dd4-7958-46af-9783-27ce8f26065f (archived https://web.archive.org/web/20240502120153/https://www.findmypast.co.uk/image-share/59961dd4-7958-46af-9783-27ce8f26065f ) The author was confidential Assistant to the Director of Naval Intelligence. The title 40 O. B. refers to Room 40 (Old Building) where Sir Alfred Ewing and his staff of Naval Intelligence codebreakers worked. 40 O.B. was part of the Intelligence Division but physically apart from the I.D. Offices and was kept very secret.
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About this work
Ebook · 40 O.B. Or How the War was Won [1932, British Naval Intelligence] · Hugh Cleland Hoy · Internet Archive
Great Britain Naval Intelligence · Great Britain Royal Navy · Great Britain Admiralty · World War 1914-1918 · World War 1914-1918 – espionage · World War 1914-1918 – spies · spies · World War 1914-1918 – Secret Service · World War 1914-1918 – British Naval Intelligence – codebreakers · World War 1914-1918 – British Naval Intelligence – Sir Alfred Ewing – codebreakers