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Topic
- Bodies of water 18
- Northwest, Pacific 18
- River engineering 18
- Rivers 18
- United States. Congress--Records and correspondence 17
- River surveys 15
- River channels 13
- Canals 10
- Harbors 8
- Rapids 8
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Region
- Columbia River >> Douglas County >> Washington >> United States 18
- Oregon >> United States 17
- Willamette River >> Multnomah County >> Oregon >> United States 17
- Washington >> United States 16
- Snake River >> Franklin County >> Washington >> United States 14
- Coos Bay >> Coos County >> Oregon >> United States 6
- California >> United States 2
- Idaho >> United States 2
- Nehalem River >> Tillamook County >> Oregon >> United States 2
- Umpqua River >> Douglas County >> Oregon >> United States 2
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License
- Creative Commons: Public Domain Mark 1.0 18
Format
- application/pdf 18