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- Canals--Design and construction--Costs 4
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 4
- Cowlitz River >> Cowlitz County >> Washington >> United States 4
- Nooksack River >> Whatcom County >> Washington >> United States 4
- Portland >> Clackamas County >> Oregon >> United States 4
- Willamette River >> Multnomah County >> Oregon >> United States 4
- Chehalis River >> Grays Harbor County >> Washington >> United States 3
- Skagit River >> Skagit County >> Washington >> United States 3
- Snake River >> Franklin County >> Washington >> United States 3
- Snohomish River >> Snohomish County >> Washington >> United States 3
- Astoria >> Clatsop County >> Oregon >> United States 2
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Type
- Collection 4