Western Waters Digital Library
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Topic
- River engineering 9
- United States--Appropriations and expenditures 8
- River surveys 6
- Transportation 5
- Bodies of water 3
- Canals--Design and construction--Costs 3
- Dams--Design and construction 3
- Railroad engineering 3
- West (U.S.) 3
- Locks (Hydraulic engineering) 2
- United States. Congress--Records and correspondence 2
- Cascade Range 1
- Military maps 1
- Military topography 1
- Northwest, Pacific 1