Subject
- Airplanes, Private -- Cost of operation1
- Airplanes, Private -- Economic aspects1
- Biology -- Study and teaching -- Oregon1
- Brucellosis -- United States1
- Camping -- Oregon1
- Conservation of natural resources -- Study and teaching -- Oregon1
- Dairy microbiology -- United States1
- Dairy products -- Sanitation -- United States1
- Foodborne diseases -- United States1
- Machinery industry -- Switzerland1
- Machinery industry -- United States1
- Natural resources -- Study and teaching -- Oregon1
- Private planes1
- Puget Sound (Wash.) -- Economic conditions1
- Regional planning -- Washington (State) -- Puget Sound1
- United States -- Economic conditions1