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Topic
- Bodies of water 26
- River surveys 26
- Rivers 26
- River engineering 25
- United States. Congress--Records and correspondence 25
- River channels 20
- Harbors 19
- Northwest, Pacific 14
- West (U.S.) 12
- Canals 10
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Region
- Columbia River >> Douglas County >> Washington >> United States 26
- Oregon >> United States 26
- Washington >> United States 26
- Willamette River >> Multnomah County >> Oregon >> United States 25
- Snake River >> Franklin County >> Washington >> United States 20
- Coos Bay >> Coos County >> Oregon >> United States 12
- California >> United States 10
- Clearwater River >> Nez Perce County >> Idaho >> United States 6
- Idaho >> United States 6
- San Francisco Bay >> San Mateo County >> California >> United States 6
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Language
- English 26
Collection
- Western Waters Digital Library 26
Institution
- University of Oregon 26