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Topic
- River engineering 16
- Rivers 16
- Bodies of water 15
- United States. Congress--Records and correspondence 15
- River surveys 14
- Northwest, Pacific 10
- River channels 10
- Harbors 8
- Canals 6
- Rapids 5
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Region
- Columbia River >> Douglas County >> Washington >> United States 16
- Willamette River >> Multnomah County >> Oregon >> United States 16
- Oregon >> United States 14
- Washington >> United States 13
- Snake River >> Franklin County >> Washington >> United States 9
- California >> United States 7
- Umpqua River >> Douglas County >> Oregon >> United States 4
- San Francisco Bay >> San Mateo County >> California >> United States 3
- Coos Bay >> Coos County >> Oregon >> United States 2
- Sacramento River >> Contra Costa County >> California >> United States 2
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Format
- application/pdf 16
Decade
- 1870-1879 16