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Topic
- Bodies of water 10
- Harbors 10
- River engineering 10
- River surveys 10
- Rivers 10
- United States. Congress--Records and correspondence 10
- West (U.S.) 9
- River channels 7
- Canals 1
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Region
- California >> United States 10
- Columbia River >> Douglas County >> Washington >> United States 10
- Oregon >> United States 10
- Washington >> United States 10
- Willamette River >> Multnomah County >> Oregon >> United States 10
- Snake River >> Franklin County >> Washington >> United States 7
- San Francisco Bay >> San Mateo County >> California >> United States 6
- Coos Bay >> Coos County >> Oregon >> United States 5
- San Diego River >> San Diego County >> California >> United States 5
- Clearwater River >> Nez Perce County >> Idaho >> United States 3
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Institution
- University of Oregon 10