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Tobacco curing
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18
Agricultural engineering
12
Agriculture -- Research
4
Agricultural laboratories
3
Agricultural machinery
3
Tobacco -- Harvesting
3
Tobacco -- Research
3
Contracts
2
Farm mechanization
2
Fuel
2
Plants -- Wounds and injuries
2
Tobacco industry
2
Agricultural experiment stations
1
Agricultural laborers
1
Agriculture
1
Anthracite coal
1
Crop yields
1
Equipment and supplies
1
Farm mechanization -- North Carolina
1
Statistics
1
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