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- Aeronautics, Military.8
- Bombers.[remove]8
- United States. Army. Air Corps.[remove]8
- Biplanes.7
- Smoke screens.5
- Artillery.1
- Artillerymen.1
- Howitzers.1
- Motion picture journalism--United States--History.1
- Movietonews (Firm)1
- Ordnance testing.1
- United States. Army.1