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- Transportation 54
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- Bodies of water 35
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- Rivers 33
- Canals--Design and construction--Costs 31
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 37
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- Cowlitz River >> Cowlitz County >> Washington >> United States 28
- Chehalis River >> Grays Harbor County >> Washington >> United States 27
- Snake River >> Franklin County >> Washington >> United States 26
- Nooksack River >> Whatcom County >> Washington >> United States 24
- Skagit River >> Skagit County >> Washington >> United States 24
- Snohomish River >> Snohomish County >> Washington >> United States 20
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