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Topic
- Bodies of water 17
- Rivers 17
- River engineering 14
- River surveys 14
- United States. Congress--Records and correspondence 14
- River channels 13
- Harbors 11
- Northwest, Pacific 10
- Dunagan, Willis 9
- West (U.S.) 8
- Canals 7
- Rapids 7
- United States--Armed Forces--Organization--Charts, diagrams, etc 7
- Bridges--Design and construction 6
- Pioneers 5
- Dissociation 4
- Water boundaries 4
- Dunagan, Viola 3
- Epilepsy 3
- Farm life 3