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- River engineering 65
- United States. Congress--Records and correspondence 51
- Northwest, Pacific 38
- Bodies of water 34
- Harbors 33
- River surveys 33
- Rivers 30
- River channels 22
- West (U.S.) 17
- Canals 13
- Rapids 13
- United States--Appropriations and expenditures 13
- United States--Armed Forces--Organization--Charts, diagrams, etc 9
- Bridges--Design and construction 7
- Riparian areas 5
- Transportation 3
- Jetties 2
- Railroad engineering 2
- Canals--Design and construction--Costs 1
- Conservation of natural resources 1