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- River engineering 4
- River surveys 4
- United States--Appropriations and expenditures 4
- Bodies of water 3
- Canals--Design and construction--Costs 3
- Dams--Design and construction 3
- Transportation 3
- West (U.S.) 3
- Locks (Hydraulic engineering) 2
- Rivers 2
- United States. Congress--Records and correspondence 2
- Boatbuilding 1
- Boats and boating 1
- Bridges--Design and construction 1
- Canada, Western 1
- Canals 1
- Cartography 1
- Cascade Range 1
- Dams--Surveying 1
- Discoveries in geography 1