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- Bodies of water 5
- River channels 5
- River engineering 5
- River surveys 5
- Rivers 5
- United States. Congress--Records and correspondence 5
- Harbors 4
- West (U.S.) 4
- Bridges--Design and construction 1
- Canals 1
- Elk 1
- Nature 1
- Northwest, Pacific 1
- Rapids 1
- United States--Armed Forces--Organization--Charts, diagrams, etc 1