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- Explosions.[remove]24
- Explosives.6
- Dynamite.3
- Artillery drill and tactics.2
- Blasting.2
- Bombs.2
- Fires.2
- Quarries and quarrying.2
- Railroad cars.2
- Rubble.2
- Ruined buildings.2
- Soldiers--United States.2
- United States. Army.2
- Accidents.1
- Aerial views.1
- Ammunition.1
- Apartment houses.1
- Armed Forces--Cuba.1
- Arnold, Henry Harley, 1886-1950.1
- Association of N.R.O.T.C. Colleges and Universities.1