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- Railroad tracks, 3 results
- black-and-white prints (photographs), 3 results
- Railroad facilities, 3 results
- Rivers--Oregon, 1 results
- Dams--Design and construction, 1 results
- Cities & towns, 1 results
- Hydroelectric power plants, 1 results
- Railroad construction & maintenance, 1 results
- Grain elevators, 1 results
- Railroad construction workers, 1 results