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Topic
- River engineering 44
- United States. Congress--Records and correspondence 43
- Northwest, Pacific 32
- Bodies of water 28
- Rivers 28
- River surveys 25
- River channels 21
- Harbors 19
- Canals 14
- West (U.S.) 12
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Region
- Columbia River >> Douglas County >> Washington >> United States 44
- Oregon >> United States 44
- Willamette River >> Multnomah County >> Oregon >> United States 33
- Washington >> United States 32
- Snake River >> Franklin County >> Washington >> United States 22
- Coos Bay >> Coos County >> Oregon >> United States 12
- California >> United States 11
- Idaho >> United States 7
- Clearwater River >> Nez Perce County >> Idaho >> United States 6
- San Francisco Bay >> San Mateo County >> California >> United States 6
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Institution
- University of Oregon 44