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Topic
- Dams 39
- Rivers--Oregon 36
- Flood control 28
- Fishes--Conservation 20
- Salmon 17
- Water--Pollution 5
- Irrigation 4
- Lectures and lecturing 4
- Inland water transportation 2
- Lakes--Oregon 2
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 35
- Columbia River >> Clatsop County >> Oregon >> United States 11
- Santiam River >> Marion County >> Oregon >> United States 10
- McKenzie River >> Lane County >> Oregon >> United States 8
- Portland >> Washington County >> Oregon >> United States 2
- Wallowa Lake >> Wallowa County >> Oregon >> United States 2
- Clackamas River >> Clackamas County >> Oregon >> United States 1
- Mexico >> North America 1
Collection
- OSU Special Collections & Archives Research Center 39
- Reuniting Finley and Bohlman 39
Decade
- 1940-1949 39
