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Topic
- Rivers--Oregon 65
- Waterfalls 15
- Canyons 11
- Dams 9
- Forests and forestry 5
- Rivers 3
- Basalt 2
- Irrigation canals and flumes 2
- Railroad tracks 2
- Bridges 1
- Cities and towns 1
- Dwellings 1
- Fish screens 1
- Fishing 1
- Fishways 1
- Formations (Geology) 1
- Lumber trade 1
- Mountains--Oregon 1
- Power-plants 1
- Sheep 1
