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Topic
- River engineering 28
- United States. Congress--Records and correspondence 28
- Bodies of water 22
- Rivers 22
- River surveys 21
- River channels 20
- Northwest, Pacific 19
- Harbors 15
- Canals 11
- West (U.S.) 9
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Region
- Snake River >> Franklin County >> Washington >> United States 28
- Columbia River >> Douglas County >> Washington >> United States 24
- Washington >> United States 23
- Oregon >> United States 22
- Willamette River >> Multnomah County >> Oregon >> United States 22
- Coos Bay >> Coos County >> Oregon >> United States 13
- California >> United States 8
- Clearwater River >> Nez Perce County >> Idaho >> United States 6
- Idaho >> United States 6
- San Diego River >> San Diego County >> California >> United States 5
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Institution
- University of Oregon 28