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Topic
- Bodies of water 31
- River engineering 31
- Rivers 31
- United States. Congress--Records and correspondence 30
- River surveys 28
- River channels 22
- Harbors 21
- Northwest, Pacific 17
- West (U.S.) 14
- Canals 12
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Region
- Columbia River >> Douglas County >> Washington >> United States 31
- Oregon >> United States 31
- Washington >> United States 30
- Willamette River >> Multnomah County >> Oregon >> United States 30
- Snake River >> Franklin County >> Washington >> United States 22
- California >> United States 13
- Coos Bay >> Coos County >> Oregon >> United States 12
- 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 31
Format
- application/pdf 31