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- River engineering 321
- Northwest, Pacific 202
- United States. Congress--Records and correspondence 140
- West (U.S.) 120
- Bodies of water 112
- United States--Appropriations and expenditures 100
- River surveys 90
- Railroad engineering 47
- Rivers 38
- Harbors 33
- Rapids 26
- River channels 25
- Canals 17
- United States--Armed Forces--Organization--Charts, diagrams, etc 13
- Jetties 11
- Locks (Hydraulic engineering) 9
- Bridges--Design and construction 8
- Transportation 8
- Canals--Design and construction--Costs 7
- Dams--Design and construction 5