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- Harbors 35
- River engineering 34
- United States. Congress--Records and correspondence 34
- River surveys 22
- Bodies of water 21
- Northwest, Pacific 21
- Rivers 21
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- Rapids 8
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Region
- Washington >> United States 34
- Columbia River >> Douglas County >> Washington >> United States 23
- Willamette River >> Multnomah County >> Oregon >> United States 23
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License
- Creative Commons: Public Domain Mark 1.0 35
Type
- Text 34
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Collection
- Western Waters Digital Library 35