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Topic
- United States--Appropriations and expenditures 43
- River engineering 37
- West (U.S.) 32
- Canals--Design and construction--Costs 8
- Locks (Hydraulic engineering) 5
- Transportation 5
- Dams--Design and construction 3
- Railroad engineering 3
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Region
- Columbia River >> Clatsop County >> Oregon >> United States 27
- Portland >> Clackamas County >> Oregon >> United States 23
- Willamette River >> Multnomah County >> Oregon >> United States 16
- Clatskanie River >> Columbia County >> Oregon >> United States 6
- Washington >> United States 6
- Cowlitz River >> Cowlitz County >> Washington >> United States 5
- Oregon City >> Clackamas County >> Oregon >> United States 5
- Yamhill River >> Yamhill County >> Oregon >> United States 5
- Oregon >> United States 4
- Pacific Ocean >> Earth 4
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Institution
- University of Oregon 43
Decade
- 1910-1919 43