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- Iron and steel bridges 24
- Spokane Falls (Wash. : Waterfall) 10
- Rapids 9
- Columbia River 8
- Hydroelectric power plants 7
- Spillways 6
- Railroad bridges 5
- Irrigation canals and flumes 4
- Oregon, Eastern 4
- Waterfalls 4
- Buildings--Irrigation systems 3
- Photography, Stereoscopic 3
- Spokane River (Idaho and Wash.) 2
- Architectural photography 1
- Bicycles 1
- Central business districts 1
- Coquille River (Or.) 1
- Dams 1
- Floods 1
- Flour mills 1