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Topic
- Rivers 14
- Bodies of water 13
- River engineering 13
- River surveys 13
- United States. Congress--Records and correspondence 13
- River channels 12
- Harbors 11
- West (U.S.) 7
- Canals 6
- Northwest, Pacific 6
- United States--Armed Forces--Organization--Charts, diagrams, etc 5
- Bridges--Design and construction 4
- Rapids 4
- Buildings 1
- Cities and towns 1
- Landscapes 1
- Neighborhoods 1