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- River engineering 141
- Northwest, Pacific 128
- United States. Congress--Records and correspondence 124
- Rivers 40
- Harbors 31
- Bodies of water 29
- River surveys 27
- River channels 26
- Rapids 23
- Canals 17
- Jetties 15
- West (U.S.) 12
- United States--Armed Forces--Organization--Charts, diagrams, etc 9
- Bridges--Design and construction 6
- Photography 5
- Riparian areas 4
- Piling (Civil engineering) 3
- Commerce 2
- Engineering--Estimates 2
- Inland navigation 2