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Subject
- Aeronautics, Military.[remove]9
- Airplanes.[remove]9
- Biplanes.4
- Military art and science.4
- Aeronautics--Study and teaching.2
- Airships.2
- Akron (Airship)2
- Formation flying.2
- Hines, John Leonard, 1868-1968.2
- Naval aviation.2
- Rosendahl, Charles E. (Charles Emery), 1892-1977.2
- Accidents.1
- Air pilots, Military.1
- Air pilots--United States.1
- Bombers.1
- Curtiss-Wright Corporation.1
- Douglas Aircraft Company.1
- Engineering.1
- Hoover, Herbert Charles, 1903-1969.1
- Hoover, Herbert, 1874-1964--Family.1