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Topic
- Northwest, Pacific 147
- River engineering 145
- Bodies of water 89
- West (U.S.) 87
- United States. Congress--Records and correspondence 59
- Railroad engineering 47
- River surveys 26
- United States--Appropriations and expenditures 26
- Bridges--Design and construction 18
- Dams--Design and construction 14
- Rivers 14
- Canals--Design and construction--Costs 12
- Transportation 12
- Water resources development 10
- Locks (Hydraulic engineering) 4
- Rapids 4
- Photography 3
- Harbors 2
- Maps 2
- Riparian areas 2
