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Topic
- Hops 64
- Universities and colleges 52
- Universities and colleges--Finance 33
- Oregon State University. Agricultural Experiment Station 24
- Universities and colleges--Periodicals 21
- Hops--Diseases and pests 18
- United States. Department of Agriculture 16
- Hunting 10
- Waterfowl 9
- Mints (Plants) 6
- Agriculture 5
- Lakes--Oregon 5
- Migratory birds 5
- Rivers--Oregon 5
- Wildlife refuges 5
- Conservation of natural resources 3
- Forests and forestry 3
- Game and game-birds 3
- Wildlife conservation 3
- Burning of land 2