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Subject
- Fort Moultrie (S.C.)35
- Harbors--Traffic control[remove]35
- Historic sites35
- United States--History--Civil War, 1861-1865--Battlefields35
- Conservation and restoration22
- Engineering and construction5
- Artillery4
- Aerial surveys2
- Flags--United States2
- Visitors' centers2
- Marine radio stations1
- Navies--Officers1
- Radio operators1
- Walls1