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- Rivers--Oregon 16
- Canyons 11
- Bridges 5
- Dams 4
- Hawks 4
- Formations (Geology) 3
- Beavers 2
- Birds--Nests 2
- Pine 2
- Trapping 2
- Wildlife relocation 2
- Bridges--Design and construction 1
- Mountains--Oregon 1
- Railroad bridges 1
- Rivers 1