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Topic
- Dams 67
- Rivers--Oregon 67
- Flood control 31
- Fishes--Conservation 21
- Salmon 21
- Lectures and lecturing 18
- Inland water transportation 9
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- Water--Pollution 5
- Oregon Audubon Society 4
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 67
- Columbia River >> Clatsop County >> Oregon >> United States 18
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Collection
- OSU Special Collections & Archives Research Center 67
- Reuniting Finley and Bohlman 67
