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Subject
- Inventions.[remove]51
- Inventors.19
- Aeronautics.17
- Airplanes.9
- Curiosities and wonders.9
- Boats and boating.4
- Engineering.3
- Stunt flying.3
- Aeronautics--Safety measures.2
- Burnelli, Vincent J.2
- Edison, Thomas A. (Thomas Alva), 1847-1931.2
- Guggenheim, Harry Frank, 1890-1971.2
- Helicopters.2
- Locomotives.2
- Miniature objects.2
- Physics.2
- Railroad trains.2
- Speeches, addresses, etc., American.2
- Sports.2
- Wit and humor.2