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Topic
- Canals--Design and construction--Costs 27
- Dams--Design and construction 25
- West (U.S.) 25
- Transportation 23
- Bodies of water 22
- Northwest, Pacific 22
- Rivers 22
- Water resources development 22
- Locks (Hydraulic engineering) 3
- River engineering 2
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Region
- Portland >> Clackamas County >> Oregon >> United States 27
- Columbia River >> Clatsop County >> Oregon >> United States 25
- Willamette River >> Multnomah County >> Oregon >> United States 25
- Cowlitz River >> Cowlitz County >> Washington >> United States 22
- Snake River >> Franklin County >> Washington >> United States 22
- Chehalis River >> Grays Harbor County >> Washington >> United States 20
- Nooksack River >> Whatcom County >> Washington >> United States 20
- Skagit River >> Skagit County >> Washington >> United States 20
- Snohomish River >> Snohomish County >> Washington >> United States 18
- Astoria >> Clatsop County >> Oregon >> United States 11
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Format
- image/jpeg 27