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Topic
- West (U.S.) 20
- Bodies of water 17
- River engineering 17
- Rivers 15
- United States. Congress--Records and correspondence 15
- River surveys 14
- Harbors 13
- River channels 10
- Rapids 5
- Canals 3
- United States--Appropriations and expenditures 3
- Maps 2
- Northwest, Pacific 2
- Railroad engineering 2
- United States--Armed Forces--Organization--Charts, diagrams, etc 2
- Water-power 2
- Agriculture 1
- Bridges--Design and construction 1
- Canals--Design and construction--Costs 1
- Conservation of natural resources 1