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- Bodies of water 15
- Rivers 15
- West (U.S.) 13
- Northwest, Pacific 12
- Canals--Design and construction--Costs 10
- Dams--Design and construction 10
- Transportation 10
- Water resources development 10
- River engineering 5
- United States. Congress--Records and correspondence 5
- Harbors 4
- River surveys 4
- Rapids 2
- River channels 2
- Canals 1
- United States--Armed Forces--Organization--Charts, diagrams, etc 1