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- United States--Appropriations and expenditures 47
- River engineering 44
- River surveys 28
- West (U.S.) 13
- United States. Congress--Records and correspondence 7
- Locks (Hydraulic engineering) 5
- Dams--Design and construction 4
- Canals--Design and construction--Costs 3
- Transportation 3
- Bodies of water 2
- Bridges--Design and construction 1
- Military maps 1
- Military topography 1
- Northwest, Pacific 1
- Railroad construction & maintenance 1
- Railroad engineering 1