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Topic
- United States--Appropriations and expenditures 11
- River engineering 10
- River surveys 6
- Bodies of water 3
- Dams--Design and construction 3
- Transportation 3
- United States. Congress--Records and correspondence 3
- Canals--Design and construction--Costs 2
- Locks (Hydraulic engineering) 2
- Railroad engineering 2
- West (U.S.) 2
- Bridges--Design and construction 1
- Cascade Range 1
- Military maps 1
- Military topography 1
- Railroad construction & maintenance 1
