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- Pears--Varieties 43
- Agricultural experiment stations 23
- World War, 1939-1945 23
- Oregon Agricultural College. Experiment Station 21
- Plants, Cultivated--Field experiments 17
- Sulfur fertilizers 13
- Agriculture 10
- Alien plants 6
- Oregon State Agricultural College. Agricultural Experiment Station 6
- Pectin 5
- Tillage--Research 5
- Gluten 4
- Oregon State College. Agricultural Experiment Station 4
- Sheep--Feeding and feeds 4
- Agricultural machinery 3
- Croplands 3
- Livestock 3
- Pears 3
- Plants--Wounds and injuries 3
- Salvage (Waste, etc.) 3