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- Architecture, American 333
- Architecture--United States 332
- River engineering 236
- Northwest, Pacific 215
- United States. Congress--Records and correspondence 123
- Bodies of water 89
- West (U.S.) 86
- United States--Appropriations and expenditures 58
- River surveys 54
- Railroad engineering 45
- Bridges--Design and construction 18
- Rivers 18
- Rapids 13
- Harbors 12
- Transportation 12
- Canals--Design and construction--Costs 11
- Dams--Design and construction 11
- Photography 11
- Jetties 9
- Water resources development 9