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- River engineering 336
- Northwest, Pacific 211
- United States. Congress--Records and correspondence 143
- West (U.S.) 122
- Bodies of water 115
- United States--Appropriations and expenditures 105
- River surveys 95
- Railroad engineering 50
- Rivers 44
- Harbors 34
- River channels 27
- Rapids 26
- Canals 19
- Jetties 17
- United States--Armed Forces--Organization--Charts, diagrams, etc 14
- Locks (Hydraulic engineering) 12
- Transportation 11
- Bridges--Design and construction 9
- Canals--Design and construction--Costs 9
- Dams--Design and construction 7