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Topic
- Barges 19
- Columbia River 6
- Rivers 6
- Docks 4
- Bridges 3
- Cranes, derricks, etc 2
- Fireworks 2
- Hoisting machinery 2
- Iron and steel bridges 2
- Paddle steamers 2
- Rivers--Oregon 2
- Snow 2
- Waterways 2
- Bridges--Design and construction 1
- Cables 1
- Cargo ships 1
- Construction equipment 1
- Drawbridges 1
- Harbors 1
- Locks (Hydraulic engineering) 1
