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Topic
- Irrigation 6
- Dams 4
- Rivers--Oregon 4
- Fishes--Conservation 2
- Flood control 2
- Lectures and lecturing 2
- Forests and forestry 1
- Inland water transportation 1
- Salmon 1
Work Type
- clippings (information artifacts) 6
- admission tickets 1
Region
- Santiam River >> Marion County >> Oregon >> United States 2
- Sweet Home >> Linn County >> Oregon >> United States 2
- Bonneville Dam >> Multnomah County >> Oregon >> United States 1
- Columbia River >> Clatsop County >> Oregon >> United States 1
- Denver >> Denver County >> Colorado >> United States 1
- Willamette River >> Multnomah County >> Oregon >> United States 1
Decade
- 1930-1939 6
