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- Bodies of water 5
- River engineering 5
- Rivers 5
- United States. Congress--Records and correspondence 5
- Harbors 4
- River surveys 4
- West (U.S.) 3
- Northwest, Pacific 2
- Rapids 2
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Region
- Columbia River >> Douglas County >> Washington >> United States 5
- Oregon >> United States 5
- Umpqua River >> Douglas County >> Oregon >> United States 5
- Willamette River >> Multnomah County >> Oregon >> United States 5
- Washington >> United States 4
- California >> United States 3
- Snake River >> Franklin County >> Washington >> United States 3
- Sacramento River >> Contra Costa County >> California >> United States 2
- San Diego River >> San Diego County >> California >> United States 2
- Clearwater River >> Nez Perce County >> Idaho >> United States 1
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Collection
- Western Waters Digital Library 5