Subject
- Agriculture -- Oregon -- Experimentation1
- Douglas fir -- Harvesting -- Oregon1
- Douglas fir -- Harvesting -- Washington (State)1
- Drainage -- Oregon1
- Electric transformers1
- Forests and forestry1
- Landscape gardening1
- Logging -- Oregon1
- Logging -- Washington (State)1
- Military railroads1
- Oregon1
- Oregon Agricultural College. Experiment Station1
- Railroads -- Ties1
- Timber1
- Trees -- United States1
- Wood1