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- Canals 17
- Rivers 8
- Bodies of water 7
- River channels 7
- River engineering 7
- River surveys 7
- United States--Armed Forces--Organization--Charts, diagrams, etc 7
- United States. Congress--Records and correspondence 7
- Rapids 6
- Bridges--Design and construction 5
- Harbors 5
- Northwest, Pacific 5
- Bridges 4
- Agriculture 3
- Cows 3
- Farms 3
- Irrigation 3
- Livestock 3
- Roads 2
- West (U.S.) 2