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Topic
- West (U.S.) 21
- Bodies of water 17
- River engineering 17
- Rivers 15
- United States. Congress--Records and correspondence 15
- River surveys 14
- Harbors 13
- River channels 10
- Rapids 5
- United States--Appropriations and expenditures 4
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Region
- Oregon >> United States 21
- Washington >> United States 19
- Columbia River >> Douglas County >> Washington >> United States 16
- Willamette River >> Multnomah County >> Oregon >> United States 15
- California >> United States 11
- Snake River >> Franklin County >> Washington >> United States 9
- Coos Bay >> Coos County >> Oregon >> United States 7
- Idaho >> United States 7
- San Francisco Bay >> San Mateo County >> California >> United States 7
- Clearwater River >> Nez Perce County >> Idaho >> United States 5
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Collection
- Western Waters Digital Library 21