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Topic
- Rivers 37
- Bodies of water 36
- River engineering 33
- United States. Congress--Records and correspondence 32
- River surveys 31
- River channels 23
- Northwest, Pacific 22
- Harbors 21
- West (U.S.) 15
- Canals 13
- Rapids 13
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- Bridges--Design and construction 6
- Conservation of natural resources 4
- Water-power 4
- Water resources development 3
- Agriculture 2
- Fisheries 2
- Irrigation 2
- Maps 2