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- Bridge of the Gods (Or. and Wash. : Natural bridge) 18
- Mountains 13
- Rapids 13
- Forests and forestry 10
- Columbia River 4
- Columbia River Valley 3
- Fishing 3
- Trees 2
- Columbia River Gorge (Or. and Wash.) 1
- Fishwheels 1
- Nature 1
- Riparian areas 1
- Rivers 1
