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- River engineering 200
- Northwest, Pacific 184
- Bodies of water 141
- West (U.S.) 130
- United States. Congress--Records and correspondence 99
- River surveys 64
- Rivers 63
- United States--Appropriations and expenditures 52
- Railroad engineering 49
- Dams--Design and construction 32
- Transportation 32
- Canals--Design and construction--Costs 31
- Water resources development 26
- Bridges--Design and construction 24
- Harbors 23
- River channels 23
- Rapids 17
- Canals 14
- United States--Armed Forces--Organization--Charts, diagrams, etc 12
- Locks (Hydraulic engineering) 8