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Topic
- Dams--Design and construction 11
- Bodies of water 9
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- Northwest, Pacific 9
- Rivers 9
- Transportation 9
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- River engineering 2
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 11
- Willamette River >> Multnomah County >> Oregon >> United States 11
- Portland >> Clackamas County >> Oregon >> United States 10
- Chehalis River >> Grays Harbor County >> Washington >> United States 9
- Cowlitz River >> Cowlitz County >> Washington >> United States 9
- Nooksack River >> Whatcom County >> Washington >> United States 9
- Skagit River >> Skagit County >> Washington >> United States 9
- Snake River >> Franklin County >> Washington >> United States 9
- Snohomish River >> Snohomish County >> Washington >> United States 9
- Astoria >> Clatsop County >> Oregon >> United States 1
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- 1890-1899 11