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- Bodies of water 1
- Northwest, Pacific 1
- Railroad engineering 1
- Railroads--Design and construction 1
- River engineering 1
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Region
- Cascade Locks >> Hood River County >> Oregon >> United States 1
- Columbia River >> Douglas County >> Washington >> United States 1
- Snake River >> British Columbia >> Canada 1
- Willamette River >> Multnomah County >> Oregon >> United States 1
- Yamhill River >> Yamhill County >> Oregon >> United States 1
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