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Subject
- Historic sites29
- Park rangers27
- Conservation and restoration25
- United States--History--Civil War, 1861-186519
- Fort Sumter National Monument (Agency : U.S.)17
- United States--History--Civil War, 1861-1865--Battlefields9
- Fort Moultrie (S.C.)8
- Artillery7
- Boats3
- Concrete--Cracking3
- Engineering and construction3
- Excavation2
- Museums2
- Docks1
- Hampton Plantation (S.C.)1
- Truck-mounted cranes1
- Visitors' centers1
- Watermelons1