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- River engineering 118
- West (U.S.) 115
- Bodies of water 104
- Northwest, Pacific 101
- Railroad engineering 49
- United States--Appropriations and expenditures 43
- Dams--Design and construction 32
- Canals--Design and construction--Costs 31
- Transportation 28
- Rivers 26
- River surveys 25
- Water resources development 25
- Locks (Hydraulic engineering) 8
- Government publications 5
- Bridges--Design and construction 2
- Maps 2
- Railroad construction & maintenance 2
- United States--Armed Forces--Organization--Charts, diagrams, etc 2
- Cascade Range 1
- Railroads--Design and construction 1