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- Hops 27
- Oregon State University. Agricultural Experiment Station 17
- United States. Department of Agriculture 10
- Hops--Diseases and pests 5
- Mints (Plants) 5
- Plant diseases 2
- Brewing 1
- California Agricultural Experiment Station 1
- Idaho Agricultural Experiment Station 1
- Master Brewers' Association of the United States 1
- Washington Agricultural Experiment Station 1
