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- River engineering 77
- Bodies of water 75
- Northwest, Pacific 75
- West (U.S.) 75
- Railroad engineering 45
- River steamers 18
- Paddle steamers 12
- Locks (Hydraulic engineering) 11
- Canals--Oregon 10
- Photography, Stereoscopic 10
- Boats and boating 8
- Cascades (Or. and Wash.) 8
- River boats 8
- Steamboats 8
- Waterways 8
- Columbia River 7
- Architecture, American 6
- Architecture--United States 6
- United States--Appropriations and expenditures 3
- River surveys 2
