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Topic
- River engineering 15
- Rivers 15
- Bodies of water 14
- River surveys 14
- United States. Congress--Records and correspondence 14
- River channels 13
- Harbors 11
- Canals 7
- Northwest, Pacific 7
- United States--Armed Forces--Organization--Charts, diagrams, etc 7
- West (U.S.) 7
- Bridges--Design and construction 6
- Rapids 6
- Dams 1
- Hydroelectric power plants 1
- Water-power 1