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Topic
- Bodies of water 16
- Rapids 16
- Rivers 16
- River engineering 12
- River surveys 12
- United States. Congress--Records and correspondence 12
- Northwest, Pacific 11
- 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 4
- Riparian areas 4
- Mountains 2
- Cliffs 1
- Locks (Hydraulic engineering) 1
- Postcards 1
- Steamboats 1