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Aeronautics, Military.
1
Antiaircraft artillery.
1
Biplanes.
1
Bombers.
1
Bombing, Aerial.
1
Bombs.
1
Curtiss aircraft.
1
Drill and minor tactics.
1
Explosions.
1
Military art and science.
1
Military weapons.
1
Railway artillery.
1
Soldiers--United States.
1
United States. Army.
1
United States. Army. Air Corps.
1
Weapons.
1