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- Rivers--Oregon 36
- Formations (Geology) 8
- Fishwheels 6
- Cities and towns 5
- Waterfalls 5
- Railroad tracks 4
- Salmon 4
- Fishing 3
- Floods 3
- Bridges 2
- Canneries 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