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- Bodies of water 32
- Rivers 32
- United States. Congress--Records and correspondence 32
- River engineering 31
- River surveys 29
- River channels 23
- Harbors 21
- Northwest, Pacific 18
- West (U.S.) 15
- Canals 13
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Region
- Columbia River >> Douglas County >> Washington >> United States 32
- Willamette River >> Multnomah County >> Oregon >> United States 32
- Oregon >> United States 31
- Washington >> United States 30
- Snake River >> Franklin County >> Washington >> United States 23
- California >> United States 13
- Coos Bay >> Coos County >> Oregon >> United States 13
- Idaho >> United States 7
- San Francisco Bay >> San Mateo County >> California >> United States 7
- Clearwater River >> Nez Perce County >> Idaho >> United States 6
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License
- Creative Commons: Public Domain Mark 1.0 32
Language
- English 32
Collection
- Western Waters Digital Library 32