Subject
- Trees14
- Engineering drawings13
- Fire pot cooking13
- Powder magazines13
- Warehouses13
- Flagpoles12
- Catholic church buildings11
- Drawing11
- Excavation11
- Truck-mounted cranes11
- Earthmoving machinery10
- Bulldozers9
- Columns8
- Indians of North America8
- Navy-yards and naval stations8
- Parking lots8
- Construction workers7
- Jetties6
- Ships6
- Doors5