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- Bodies of water 10
- Rivers 9
- River engineering 7
- United States. Congress--Records and correspondence 7
- West (U.S.) 7
- River channels 6
- River surveys 6
- Harbors 5
- Northwest, Pacific 5
- Water-power 5
- Maps 4
- Conservation of natural resources 3
- Water resources development 3
- Canals 2
- Fisheries 2
- Hydroelectric power plants 2
- Photography 2
- Renewable energy sources 2
- United States--Armed Forces--Organization--Charts, diagrams, etc 2
- Water-supply engineering 2