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- Landscape photography 8
- Spokane River (Idaho and Wash.) 8
- Columbia River 3
- River engineering 2
- River surveys 2
- United States--Appropriations and expenditures 2
- Canals--Design and construction--Costs 1
- Canyons 1
- Dams--Design and construction 1
- Government publications 1
- Locks (Hydraulic engineering) 1
- Nature photography 1
- Spokane River Valley (Idaho and Wash.) 1