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- West (U.S.) 49
- United States--Appropriations and expenditures 39
- River engineering 37
- Canals--Design and construction--Costs 32
- Dams--Design and construction 32
- Transportation 31
- Bodies of water 27
- Northwest, Pacific 25
- Rivers 25
- Water resources development 25
- River surveys 14
- Locks (Hydraulic engineering) 7
- Government publications 4
- Railroad engineering 3
- Bridges--Design and construction 2
- Maps 2
- Cascade Range 1
- Railroad construction & maintenance 1
- United States. Congress--Records and correspondence 1