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| Airplanes, Military (27) |
| Airplanes--Flight testing (27) |
| Airplanes--Handling characteristics (27) |
| Airplanes--Testing (27) |
| Biplanes (27) |
| Curtiss aircraft (4) |
| Fokker airplanes (4) |
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| Douglas airplanes (3) |
| Bombers (2) |