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- River engineering 166
- West (U.S.) 95
- Northwest, Pacific 89
- Bodies of water 80
- United States--Appropriations and expenditures 74
- Railroad engineering 48
- River surveys 46
- Jetties 11
- Locks (Hydraulic engineering) 11
- Canals--Design and construction--Costs 8
- Rivers 8
- United States. Congress--Records and correspondence 8
- Transportation 7
- Dams--Design and construction 6
- Photography 5
- River channels 4
- Maps 3
- Piling (Civil engineering) 3
- Railroad construction & maintenance 3
- United States--Armed Forces--Organization--Charts, diagrams, etc 3