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Re: Operational Impacts of Ultra on the Air War?
Here are two fine books on the subject. Sir Ralph Bennett, a Cambridge Univ. mathematics professor, spent the war in Betchley Park Hut 3. So in addition to his scholarly research, he speaks with first-hand knowledge.
Bennett, Ralph. ULTRA in the West: The Normandy Campaign 1944-45. New York: Charles Scribner’s Sons, 1979. ISBN: 0-684-16704-2. Hb. Dj. 336p. Maps. Footnotes. Bibliography. Index.
Bennett, Ralph. ULTRA and Mediterranean Strategy. New York: William Morrow and Co., 1989. ISBN: 0-68808175-4. Hb. Dj. 496p. Maps. Appendices. Extensive footnotes. Bibliography. Index.
There is also an excellent Top Secret Ultra postwar study on how signals intelligence, including ULTRA, impacted the strategic air war over Germany and the occupied West.
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