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- Hops 1237
- Beer 222
- Brewing 65
- Agriculture 64
- Oregon State University. Agricultural Experiment Station 25
- Harvesting 23
- Hops--Diseases and pests 19
- United States. Department of Agriculture 17
- Agricultural laborers 15
- Portraits, Group 13
- Hops industry 12
- Agricultural implements 6
- Mints (Plants) 6
- Pests 6
- Scientific apparatus and instruments 6
- Beer stamps 5
- Congresses and conventions 5
- Crops 5
- Universities and colleges--Faculty 5
- Croplands 4