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- Northwest, Pacific 233
- River engineering 186
- United States. Congress--Records and correspondence 117
- Bodies of water 89
- West (U.S.) 86
- Railroad engineering 46
- Rivers 24
- Bridges--Design and construction 16
- Photography 15
- Harbors 13
- Jetties 13
- Rapids 13
- Transportation 13
- Canals--Design and construction--Costs 10
- Dams--Design and construction 10
- Water resources development 10
- Riparian areas 7
- Poetry 6
- Lighthouses 5
- Canals 4