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- Railroad bridges 22
- Rivers--Oregon 11
- Bridges 4
- Rivers 3
- Cities and towns 2
- Paddle steamers 2
- Building 1
- Canyons 1
- Civilian Conservation Corps (U.S.) 1
- Cutover lands 1
- Forests and forestry 1
- Logging 1
- Lumber trade 1
- Perimeters (Boundaries) 1
- Railroad cars 1
- Waterfalls 1
