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Topic
- Bodies of water 41
- Rivers 29
- Canals--Design and construction--Costs 26
- Dams--Design and construction 26
- Transportation 26
- West (U.S.) 26
- Northwest, Pacific 25
- Water resources development 25
- Oregon--History 5
- Docks 4
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Region
- Portland >> Clackamas County >> Oregon >> United States 41
- Columbia River >> Clatsop County >> Oregon >> United States 27
- Cowlitz River >> Cowlitz County >> Washington >> United States 27
- Willamette River >> Multnomah County >> Oregon >> United States 27
- Snake River >> Franklin County >> Washington >> United States 25
- Chehalis River >> Grays Harbor County >> Washington >> United States 23
- Nooksack River >> Whatcom County >> Washington >> United States 23
- Skagit River >> Skagit County >> Washington >> United States 23
- Snohomish River >> Snohomish County >> Washington >> United States 20
- Astoria >> Clatsop County >> Oregon >> United States 13
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