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- River engineering 326
- Northwest, Pacific 207
- United States. Congress--Records and correspondence 137
- West (U.S.) 118
- Bodies of water 109
- United States--Appropriations and expenditures 101
- River surveys 87
- Railroad engineering 48
- Rivers 41
- Harbors 31
- River channels 26
- Rapids 23
- Canals 17
- Jetties 16
- United States--Armed Forces--Organization--Charts, diagrams, etc 12
- Locks (Hydraulic engineering) 10
- Bridges--Design and construction 8
- Canals--Design and construction--Costs 8
- Transportation 7
- Dams--Design and construction 5