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- Railroad engineering 2
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- Clackamas Rapids >> Clackamas County >> Oregon >> United States 2
- Oregon City >> Clackamas County >> Oregon >> United States 2
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- Willamette River >> Multnomah County >> Oregon >> United States 2
- Yamhill River >> Yamhill County >> Oregon >> United States 2
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- Celilo Canal >> Wasco County >> Oregon >> United States 1
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- Clatskanie River >> Columbia County >> Oregon >> United States 1
- Columbia River >> Clatsop County >> Oregon >> United States 1
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