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- Harbors 23
- River engineering 23
- United States. Congress--Records and correspondence 23
- River surveys 22
- Bodies of water 21
- Rivers 21
- River channels 14
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- Northwest, Pacific 10
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Region
- Columbia River >> Douglas County >> Washington >> United States 23
- Willamette River >> Multnomah County >> Oregon >> United States 23
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- California >> United States 12
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License
- Creative Commons: Public Domain Mark 1.0 23
Type
- Text 22
- Collection 1