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The Ninth Air Force in World War II - by Kenn C. Rust.
2 Group RAF (A Complete History 1936 - 1945) - Michael J.F Bowyer
2nd Tactical Air Force Vol. I, II, III. - Chris Shores.
Are probably the three most important books for any extensive info on the tactical role of the air force in Europe, World War II. The 2 Group book can set you back .. a lot of money, as I've seen the hard-back (which I have) selling for over £100 ($190).