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Subject
- Bombers.[remove]5
- United States. Army.[remove]5
- Aeronautics, Military.1
- Aeronautics.1
- Air mail service--United States.1
- Air pilots--France.1
- Air pilots--Training of.1
- Air warfare.1
- Allied Forces.1
- Artillery.1
- Artillerymen.1
- Biplanes.1
- Bombing, Aerial.1
- Bombs.1
- Canada. Canadian Army.1
- Explosions.1
- Flight schools--France.1
- Howitzers.1
- Monoplanes.1
- Oakland International Airport (Calif.)1