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Subject (Topic)
- Batteries (Ordnance)8
- Armored vessels7
- Steamboats6
- Batteries (Ordnance)5
- Armored vessels4
- Blockade4
- Bombardment4
- Torpedoes4
- Ordnance4
- Defenses3
- Parrott gun3
- Siege warfare3
- Armed Forces Officers3
- Siege warfare3
- Turret ships3
- African American fire fighters2
- Fire fighters--1860-18702
- Gunboats2
- Islands2
- Military camps2