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- Rivers--Oregon 32
- Formations (Geology) 8
- Fishwheels 6
- Railroad tracks 4
- Salmon 4
- Waterfalls 3
- Canneries 2
- Fishing 2
- Forests and forestry 2
- Lighthouses 2
- Locks (Hydraulic engineering) 2
- Log transportation 2
- Lumber trade 2
- Paddle steamers 2
- Seining 2
- Agriculture 1
- Boats 1
- Bridges 1
- Bridges--Design and construction 1
- Canals 1