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Subject
- Helicopters.[remove]5
- Aeronautics.3
- Inventions.2
- Aeronautical engineers.1
- Autogiro Company of America.1
- Autogiros.1
- Avro airplanes.1
- Cierva, Juan de la, 1895-1936.1
- Engineers.1
- Helicopter pilots.1
- Inventors.1
- Marching bands--United States.1
- Marching.1
- Parade floats.1
- Parades & processions.1
- Pitcairn, Harold F., 1897-1960.1