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Tobacco curing
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22
Agricultural engineering
9
Agriculture -- Research
5
Agricultural machinery
3
Tobacco -- Research
3
Flue-cured tobacco
2
Fuel
2
Plants -- Wounds and injuries
2
Tobacco
2
Tobacco industry
2
Agricultural experiment stations
1
Agricultural implements
1
Agronomy
1
Anthracite coal
1
Automation -- Human factors
1
Barns
1
Contracts
1
Design -- Human factors
1
Electricity
1
Greenhouses
1
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