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Aerial surveys
4
Artillery
13
Building, Bombproof
1
Bulldozers
1
Conservation and restoration
31
Engineering and construction
2
Fort Moultrie (S.C.)
31
Gunpowder
7
Historic sites
31
Military architecture
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31
Powder magazines
12
United States--History--Civil War, 1861-1865--Battlefields
31
Warehouses
4