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Topic
- Bodies of water 13
- River channels 13
- River engineering 13
- River surveys 13
- Rivers 13
- United States. Congress--Records and correspondence 13
- Harbors 10
- Canals 7
- United States--Armed Forces--Organization--Charts, diagrams, etc 7
- West (U.S.) 7
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Region
- Columbia River >> Douglas County >> Washington >> United States 13
- Oregon >> United States 13
- Snake River >> Franklin County >> Washington >> United States 13
- Washington >> United States 13
- Willamette River >> Multnomah County >> Oregon >> United States 13
- Coos Bay >> Coos County >> Oregon >> United States 10
- Clearwater River >> Nez Perce County >> Idaho >> United States 5
- Idaho >> United States 5
- California >> United States 4
- Cowlitz River >> Cowlitz County >> Washington >> United States 4
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Decade
- 1880-1889 13