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Topic
- Rapids 15
- Bodies of water 14
- Rivers 14
- River engineering 13
- United States. Congress--Records and correspondence 13
- River surveys 12
- Northwest, Pacific 10
- River channels 9
- Canals 8
- Harbors 8
- United States--Armed Forces--Organization--Charts, diagrams, etc 8
- West (U.S.) 5
- Bridges--Design and construction 4
- Photography 2
- Riparian areas 2
- Mountains 1
- Postcards 1
- Tugboats 1