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Subject
- Aerial surveys8
- Artillery26
- Auditoriums1
- Catholic church buildings2
- Civil engineers1
- Concrete1
- Concrete masonry1
- Concrete--Cracking2
- Conservation and restoration44
- Construction1
- Construction workers6
- Earthmoving machinery6
- Electric generators1
- Engineering and construction[remove]83
- Engineering drawings1
- Floors, Concrete1
- Fort Moultrie (S.C.)83
- General Electric Company. Electrical Systems and Technology Laboratory1
- Harbors--Traffic control5
- Historic sites83