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Topic
- Agriculture 9
- Physical sciences 8
- Hops 6
- Harvesting 4
- Agricultural diversification 2
- Beer 2
- Lectures and lecturing 2
- Lumber trade 2
- Orchards 2
- Willamette River Valley (Or.) 2
- Architecture, American 1
- Architecture--United States 1
- Barns 1
- Birds--Nests 1
- Croplands 1
- Crops 1
- Ducks 1
- Dwellings 1
- Farm buildings 1
- Farm life 1
