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Subject
- Aeronautics.[remove]2
- Autogiro Company of America.2
- Autogiros.[remove]2
- Pitcairn, Harold F., 1897-1960.[remove]2
- Aerial cinematography.1
- Aerial views.1
- Aeronautical engineers.1
- Avro airplanes.1
- Cierva, Juan de la, 1895-1936.1
- Helicopters.1
- Inventions.1
- Reporters and reporting.1
- United States Capitol (Washington, D.C.)1
- Washington Monument (Washington, D.C.)1