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- Aeronautical engineers.[remove]6
- Aeronautics, Military.2
- Aeronautics.2
- Airships.2
- Akron (Airship)2
- Engineering.2
- United States. Navy--Aviation.2
- Aeronautics--United States.1
- Airplanes, Military.1
- Airplanes.1
- Autogiro Company of America.1
- Autogiros.1
- Avro airplanes.1
- Biplanes.1
- Cierva, Juan de la, 1895-1936.1
- Douglas Aircraft Company.1
- Douglas DC-2 (Transport plane)1
- Engineers.1
- Helicopters.1
- Helium.1