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- Salmon 7
- Fish hatcheries 6
- Landscapes 5
- Rivers 5
- Energy industries 3
- Northwestern Electric Company 3
- Pipelines 3
- Columbia River Valley 2
- Columbia River 2
- Portraits, Group 2
- Waterfalls 2
- Fishing 1
- Hydraulics 1
- Lower Columbia River (Or. and Wash.) 1
- Mountains 1
- Mountains--Oregon 1
- Rivers--Oregon 1
- Spokane, Portland, and Seattle Railway 1
- Trees 1
- Valleys 1