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Topic
- Rivers--Oregon 372
- Waterfalls 36
- Bridges 33
- Forests and forestry 26
- Dams 25
- Paddle steamers 22
- Formations (Geology) 19
- Mountains--Oregon 15
- Canyons 14
- Fishing 14
- Lumber trade 14
- Canoes and canoeing 12
- Railroad tracks 12
- Boats 11
- Cities and towns 11
- Ferries 9
- Fishwheels 9
- Footbridges 9
- Log transportation 9
- Railroad bridges 9