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- Hops 174
- Beer 12
- Hops--Diseases and pests 9
- Brewing 8
- Agriculture 7
- Pests 6
- United States. Department of Agriculture 6
- Oregon State University. Agricultural Experiment Station 4
- Exhibitions 3
- Food--Drying 3
- Food--Research 3
- Harvesting 3
- Insects 3
- Agricultural implements 2
- Hop downy mildew fungus 2
- Agricultural machinery 1
- Beer stamps 1
- Cities and towns 1
- Downy mildew diseases 1
- Kilns 1