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- River engineering 147
- West (U.S.) 127
- Bodies of water 108
- Northwest, Pacific 104
- United States--Appropriations and expenditures 72
- Railroad engineering 50
- River surveys 41
- Canals--Design and construction--Costs 40
- Dams--Design and construction 34
- Transportation 34
- Rivers 28
- Water resources development 28
- Government publications 17
- Locks (Hydraulic engineering) 12
- Maps 3
- Railroad construction & maintenance 3
- United States--Armed Forces--Organization--Charts, diagrams, etc 3
- United States. Congress--Records and correspondence 3
- Cascade Range 2
- Bridges--Design and construction 1