Cross-referenced research literature and technical manuals completely matching the keyword registry records for Aviation History.
Before Amelia: Women Pilots in the Early Days of Aviation
Charles A. Lindbergh, Lone Eagle (Library of American Biography)
Wheels and Rockets
Hell on High Ground: World War II Air Crash Sites
Handbook of Great Aircraft of WWII. Paperback guide to the great planes of World War II with superb cutaway diagrams
Hell above Earth: The Startling True Story of Werner Goering's Flights Against the Luftwaffe