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- Bodies of water 10
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Canals 9
- River channels 9
- River engineering 9
- River surveys 9
- Rivers 9
- United States. Congress--Records and correspondence 9
- Northwest, Pacific 8
- Rapids 8
- Bridges--Design and construction 5
- Harbors 5
- West (U.S.) 2
- Photography 1
- Pumped storage power plants 1
- Renewable energy sources 1
- Water-power 1
- Water-supply engineering 1