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- Mid-Columbia Agricultural Research and Extension Center 11
- Universities and colleges--Faculty 9
- Mellenthin, Walter M., 1920- 7
- Pears 6
- Hood, Mount (Or.) 5
- Orchards 5
- Dobie, Norman D. 4
- Botany and Plant Pathology 3
- Hood River (Or.) 3
- Horticulture 3
- Oregon State University. Agricultural Experiment Station 3
- Aerial spraying and dusting in agriculture 1
- Apples 1
- Chemotherapy 1
- Cooney, Wilbur T. 1
- Deans (Education) 1
- Farm buildings 1
- Fruit processing plants 1
- Poultry Husbandry 1
- Poultry Science 1