Topic
- Oregon State Agricultural College 2
- Oregon State Planning Board 2
- Oregon State Planning Council 2
- Portraits 2
- Staged photography 2
- Water--Pollution 2
- Wildlife conservation 2
- Agriculture 1
- American Game Association 1
- Birds--Conservation--Law and legislation 1
- Burning of land 1
- Butchers 1
- Conservation of natural resources--Law and legislation 1
- Dams 1
- Fishes--Conservation 1
- Fishing 1
- Forests and forestry 1
- Fur-bearing animals 1
- Geological Survey (U.S.) 1
- Groundwater 1