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- River channels 29
- River engineering 25
- Rivers 24
- Bodies of water 23
- United States. Congress--Records and correspondence 23
- River surveys 22
- Northwest, Pacific 15
- Harbors 14
- Canals 13
- Rapids 10
- United States--Armed Forces--Organization--Charts, diagrams, etc 10
- West (U.S.) 10
- Bridges--Design and construction 6
- Politics and government 3
- International law 2
- Jetties 2
- Armed Forces 1
- Contamination of environment 1
- Developing countries 1
- Economic development 1