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- Architecture, American 34
- Architecture--United States 34
- River engineering 7
- United States--Appropriations and expenditures 7
- River surveys 6
- Dams--Design and construction 3
- Locks (Hydraulic engineering) 3
- Canals--Design and construction--Costs 2
- Bodies of water 1
- Bridges--Design and construction 1
- Cascade Range 1
- Railroad construction & maintenance 1
- Railroad engineering 1
- Transportation 1
- United States. Congress--Records and correspondence 1
- West (U.S.) 1