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- United States--History--Civil War, 1861-1865[remove]1,852
- Fort Sumter National Monument (Agency : U.S.)1,049
- South Carolina--History783
- Historic sites748
- Armed Forces417
- Conservation and restoration400
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- Brooks, T. B. (Thomas Benton), 1836-1900310
- Artillery operations225
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- Fort Moultrie (S.C.)65
- H.L. Hunley (Submarine)65
- Painting60
- National Underwater and Marine Agency59
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- Underwater archaeology55
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- Docks42