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- Harbors 40
- River engineering 34
- United States. Congress--Records and correspondence 34
- Bodies of water 23
- River surveys 22
- Northwest, Pacific 21
- Rivers 21
- River channels 14
- West (U.S.) 13
- Rapids 8
- Canals 7
- United States--Armed Forces--Organization--Charts, diagrams, etc 6
- Bridges--Design and construction 5
- Riparian areas 5
- Shipping 3
- Boats 2
- Angelus Studio 1
- Boat & ship industry 1
- Clipper ships 1
- Exports 1
