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- Dams 31
- Lectures and lecturing 31
- Rivers--Oregon 22
- Salmon 15
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Region
- Willamette River >> Multnomah County >> Oregon >> United States 18
- Columbia River >> Clatsop County >> Oregon >> United States 6
- Bonneville Dam >> Multnomah County >> Oregon >> United States 4
- Malheur National Wildlife Refuge >> Harney County >> Oregon >> United States 2
- New York >> New York >> United States 2
- Portland >> Washington County >> Oregon >> United States 2
- Santiam River >> Marion County >> Oregon >> United States 2
- Grand Coulee Dam >> Okanogan County >> Washington >> United States 1
- Klamath River >> Klamath County >> Oregon >> United States 1
- McKenzie River >> Lane County >> Oregon >> United States 1
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- Text 31
Collection
- OSU Special Collections & Archives Research Center 31
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- Oregon State University 31