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Subject
- Aerial surveys4
- Artillery112
- Barges1
- Barracks1
- Benches1
- Boats12
- Bricks1
- Bulldozers6
- Carpentry1
- Conservation and restoration[remove]442
- Construction workers1
- Diorama1
- Docks16
- Drawing5
- Drawings1
- Engineering drawings4
- Excavation10
- Flagpoles2
- Flags6
- Flags--United States6