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Topic
- Bodies of water 11
- Harbors 11
- River engineering 11
- River surveys 11
- Rivers 11
- United States. Congress--Records and correspondence 11
- River channels 10
- West (U.S.) 6
- Bridges--Design and construction 5
- Canals 5
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Region
- Columbia River >> Douglas County >> Washington >> United States 11
- Oregon >> United States 11
- Snake River >> Franklin County >> Washington >> United States 11
- Washington >> United States 11
- Willamette River >> Multnomah County >> Oregon >> United States 11
- Coos Bay >> Coos County >> Oregon >> United States 10
- California >> United States 4
- Clearwater River >> Nez Perce County >> Idaho >> United States 4
- Idaho >> United States 4
- Cowlitz River >> Cowlitz County >> Washington >> United States 3
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Decade
- 1880-1889 11