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Very Special Intelligence
The Story of the Admiralty's Operational Intelligence Centre, 1939-1945
By Beesly, Patrick
Descripton: An insider's account of the work of the British Operational Intelligence Centre, and the way in which it used Ultra. First published 1977.
From the uboat.net review: This book, a brand-new reprint of the 1977 original with new introduction and afterword, is written by a member of the British Operational Intelligence Centre (OIC) who took part in unmasking the German codes and their operational planning. This effo ...