Subject
- Agriculture -- Oregon1
- Agriculture -- Oregon -- Experimentation1
- Agriculture -- Study and teaching -- Oregon1
- Bulletin (United States. Division of Entomology)1
- Columbia River Valley -- Description and travel1
- Columbia River Valley -- Pictorial works1
- Conifers -- Diseases and pests -- United States1
- Electric motors -- Design and construction1
- Forest insects -- Black Hills National Forest (S.D. and Wyo.)1
- Forest insects -- United States1
- Forests and forestry1
- Insect pests -- Black Hills National Forest (S.D. and Wyo.)1
- Insect pests -- United States1
- Oregon State Agricultural College1
- Oregon State Agricultural College. Experiment Station1
- Pine -- Diseases and pests -- Black Hills National Forest (S.D. and Wyo.)1
- Plant parasites -- Black Hills National Forest (S.D. and Wyo.)1
- Public lands -- United States1
- Seattle (Wash.) -- Pictorial works1
- Surveying -- Public lands -- United States1