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Topic
- Canyons 7
- Rivers--Oregon 4
- Geology--Oregon 2
- Aerial photographs 1
- Bridges 1
- Dams 1
- Rivers--Idaho 1
Region
- Deschutes Canyon >> Jefferson County >> Oregon >> United States 2
- Grand Canyon of the Snake River >> Wallowa County >> Oregon >> United States 2
- Black Canyon Dam >> Gem County >> Idaho >> United States 1
- Crooked River >> Jefferson County >> Oregon >> United States 1
- Gem County >> Idaho >> United States 1
- Jefferson County >> Oregon >> United States 1
- Payette River >> Payette County >> Idaho >> United States 1
- Rogue River >> Curry County >> Oregon >> United States 1
- Weiser River >> Washington County >> Idaho >> United States 1
Institution
- Oregon State University 7
Decade
- 1920-1929 7
