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Topic
- River surveys 30
- Bodies of water 29
- River engineering 29
- Rivers 29
- United States. Congress--Records and correspondence 29
- Harbors 22
- River channels 21
- Northwest, Pacific 16
- West (U.S.) 14
- Canals 12
- Rapids 12
- United States--Armed Forces--Organization--Charts, diagrams, etc 9
- Bridges--Design and construction 6
- Riparian areas 2
- Conservation of natural resources 1
- Exports 1
- Industrialization 1
- Jetties 1
- Landscape protection 1
- National parks and reserves 1
