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- River engineering 34
- River surveys 34
- United States. Congress--Records and correspondence 26
- Bodies of water 25
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- River channels 20
- Harbors 19
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- Oregon >> United States 34
- Willamette River >> Multnomah County >> Oregon >> United States 30
- Washington >> United States 29
- Columbia River >> Douglas County >> Washington >> United States 25
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- Coos Bay >> Coos County >> Oregon >> United States 12
- California >> United States 10
- Clearwater River >> Nez Perce County >> Idaho >> United States 6
- Columbia River >> Clatsop County >> Oregon >> United States 6
- Idaho >> United States 6
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Institution
- University of Oregon 34