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- River engineering 4
- United States--Appropriations and expenditures 4
- River surveys 3
- West (U.S.) 3
- Architecture, American 2
- Architecture--United States 2
- Canals--Design and construction--Costs 2
- Locks (Hydraulic engineering) 2
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- Boats and boating 1
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- United States. Congress--Records and correspondence 1