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Subject (Topic)
- Batteries (Ordnance)13
- Armored vessels11
- Blockade6
- Bombardment6
- Siege warfare6
- Steamboats6
- Torpedoes6
- Ordnance5
- Turret ships5
- Armed Forces Officers3
- Defenses3
- Military camps3
- Offensive (Military science)3
- Parrott gun3
- African American fire fighters2
- Fire fighters--1860-18702
- Free African Americans--South Carolina--Charleston2
- Gunboats2
- Islands2
- Lighthouses2