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- United States--History--Civil War, 1861-1865[remove]2,206
- Fort Sumter National Monument (Agency : U.S.)1,104
- Historic sites802
- South Carolina--History783
- Conservation and restoration442
- Armed Forces437
- Artillery430
- Brooks, T. B. (Thomas Benton), 1836-1900310
- Artillery operations229
- Clippings (Books, newspapers, etc.)94
- Boats88
- Fort Moultrie (S.C.)81
- H.L. Hunley (Submarine)73
- Tourism73
- National Underwater and Marine Agency67
- Painting65
- Submarine disasters64
- Underwater archaeology63
- Fort Sumter (Charleston, S.C.)57
- Naval operations52