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- Exhibitions 146
- Straw--Utilization 25
- Oregon State University. Agricultural Experiment Station 22
- Agricultural exhibitions 15
- Universities and colleges--Faculty 8
- Oregon Museum of Science and Industry 7
- Coins--Collectors and collecting 6
- Grass seed industry 5
- Fur farming 4
- Potatoes 4
- Agriculture--Economic aspects 3
- Antiques 3
- Boersma, L. 3
- Crop and Soil Science 3
- Fruit 3
- Henderson, Robert W. (Robert Wesley), 1914-2006 3
- Hot water 3
- Machinery industry 3
- Pesticides 3
- Signs and signboards 3