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Subject
- Conservation and restoration[remove]617
- Historic sites[remove]617
- United States--History--Civil War, 1861-1865--Battlefields[remove]617
- Fort Moultrie (S.C.)615
- Artillery236
- Aerial surveys79
- Visitors' centers53
- Walls48
- Engineering and construction41
- Military architecture31
- Harbors--Traffic control22
- Docks19
- Gunpowder13
- Powder magazines13
- War memorials13
- Cemeteries12
- Flags--United States12
- Warehouses11
- Flagpoles10
- Catholic church buildings8