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- Hops 1130
- Beer 148
- Brewing 65
- Agriculture 44
- Oregon State University. Agricultural Experiment Station 25
- Hops--Diseases and pests 19
- United States. Department of Agriculture 17
- Agricultural laborers 14
- Harvesting 14
- Hops industry 12
- Agricultural implements 6
- Mints (Plants) 6
- Pests 6
- Scientific apparatus and instruments 6
- Congresses and conventions 5
- Crops 5
- Universities and colleges--Faculty 5
- Beer stamps 4
- Farm buildings 4
- Kilns 4