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Topic
- River engineering 20
- United States--Appropriations and expenditures 20
- West (U.S.) 16
- Transportation 3
- Railroad engineering 2
- Bodies of water 1
- Canals--Design and construction--Costs 1
Region
- Portland >> Clackamas County >> Oregon >> United States 20
- Columbia River >> Clatsop County >> Oregon >> United States 13
- Willamette River >> Multnomah County >> Oregon >> United States 12
- Yamhill River >> Yamhill County >> Oregon >> United States 5
- Clatskanie River >> Columbia County >> Oregon >> United States 4
- Oregon City >> Clackamas County >> Oregon >> United States 4
- Vancouver >> Clark County >> Washington >> United States 4
- Clackamas Rapids >> Clackamas County >> Oregon >> United States 3
- Cowlitz River >> Cowlitz County >> Washington >> United States 3
- Pacific Ocean >> Earth 3
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Type
- Text 19
- Collection 1
Decade
- 1910-1919 20