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- Bodies of water 16
- West (U.S.) 16
- Rivers 15
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- Dams--Design and construction 14
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- Water resources development 13
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Region
- Astoria >> Clatsop County >> Oregon >> United States 16
- Columbia River >> Clatsop County >> Oregon >> United States 15
- Cowlitz River >> Cowlitz County >> Washington >> United States 13
- Portland >> Clackamas County >> Oregon >> United States 13
- Willamette River >> Multnomah County >> Oregon >> United States 13
- Columbia City >> Columbia County >> Oregon >> United States 12
- Snake River >> Franklin County >> Washington >> United States 12
- Chehalis River >> Grays Harbor County >> Washington >> United States 11
- Nehalem Bay >> Tillamook County >> Oregon >> United States 11
- Nooksack River >> Whatcom County >> Washington >> United States 11
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Type
- Text 13
- Collection 3