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- United States. Army. Corps of Engineers 15
Topic
- Bodies of water 15
- River engineering 15
- River surveys 15
- Rivers 15
- United States. Congress--Records and correspondence 15
- River channels 14
- Canals 10
- Harbors 10
- Northwest, Pacific 10
- United States--Armed Forces--Organization--Charts, diagrams, etc 8
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Region
- Columbia River >> Douglas County >> Washington >> United States 15
- Oregon >> United States 15
- Washington >> United States 15
- Willamette River >> Multnomah County >> Oregon >> United States 15
- Snake River >> Franklin County >> Washington >> United States 14
- Coos Bay >> Coos County >> Oregon >> United States 9
- Clearwater River >> Nez Perce County >> Idaho >> United States 5
- Idaho >> United States 5
- California >> United States 3
- Cowlitz River >> Cowlitz County >> Washington >> United States 3
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