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- Bodies of water 47
- Railroad engineering 47
- River engineering 47
- West (U.S.) 47
- Northwest, Pacific 46
- Canals--Design and construction--Costs 1
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Region
- Cascade Locks >> Hood River County >> Oregon >> United States 47
- Snake River >> British Columbia >> Canada 47
- Willamette River >> Multnomah County >> Oregon >> United States 47
- Yamhill River >> Yamhill County >> Oregon >> United States 47
- Columbia River >> Clatsop County >> Oregon >> United States 46
- Astoria >> Clatsop County >> Oregon >> United States 1
- Cabinet Rapids (historical) >> Chelan County >> Washington >> United States 1
- Celilo Falls (historical) >> Wasco County >> Oregon >> United States 1
- Charleston >> Kanawha >> West Virginia >> United States 1
- Clackamas Rapids >> Clackamas County >> Oregon >> United States 1
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Decade
- 1890-1899 47