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Subject
- Historic sites97
- Fort Moultrie (S.C.)86
- Engineering and construction83
- United States--History--Civil War, 1861-1865--Battlefields82
- Visitors' centers54
- Conservation and restoration53
- Artillery34
- United States--History--Civil War, 1861-186519
- Engineering drawings15
- Walls15
- Fort Sumter National Monument (Agency : U.S.)12
- Aerial surveys8
- Construction workers6
- Earthmoving machinery6
- Harbors--Traffic control5
- Park rangers3
- Catholic church buildings2
- Clippings (Books, newspapers, etc.)2
- Concrete--Cracking2
- Engineers2