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- Architecture, American 687
- Architecture--United States 668
- Historic buildings 19
- River engineering 15
- United States--Appropriations and expenditures 15
- River surveys 14
- Dams--Design and construction 13
- Canals--Design and construction--Costs 12
- Bodies of water 11
- Transportation 11
- West (U.S.) 11
- Northwest, Pacific 10
- Rivers 10
- Water resources development 10
- Beer 4
- Hops 4
- Locks (Hydraulic engineering) 3
- Bridges--Design and construction 2
- Cascade Range 1
- Dwellings 1