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Topic
- Bodies of water 5
- Canals--Design and construction--Costs 5
- Dams--Design and construction 5
- River engineering 5
- Transportation 5
- United States--Appropriations and expenditures 5
- West (U.S.) 4
- Locks (Hydraulic engineering) 3
- Northwest, Pacific 3
- River surveys 3
- Rivers 3
- Water resources development 3
- Railroad engineering 2
- United States. Congress--Records and correspondence 2
- Bridges 1
- Bridges--Design and construction 1
- Carriages and carts 1
- Cascade Range 1
- Cities and towns 1
- Cliffs 1