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- Bodies of water 22
- River channels 22
- River engineering 22
- Rivers 22
- United States. Congress--Records and correspondence 22
- River surveys 21
- Harbors 14
- Canals 12
- Northwest, Pacific 12
- West (U.S.) 10
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Region
- Columbia River >> Douglas County >> Washington >> United States 22
- Oregon >> United States 22
- Washington >> United States 22
- Willamette River >> Multnomah County >> Oregon >> United States 22
- Snake River >> Franklin County >> Washington >> United States 20
- Coos Bay >> Coos County >> Oregon >> United States 11
- California >> United States 8
- Clearwater River >> Nez Perce County >> Idaho >> United States 6
- Idaho >> United States 6
- Cowlitz River >> Cowlitz County >> Washington >> United States 4
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