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Agricultural engineering
2
Agricultural facilities
1
Agricultural machinery
3
Agriculture -- Research
2
Burley tobacco
1
Business travel
1
Crop yields
1
Defoliation
1
Elevators
1
Employees -- Workload
1
Farm mechanization
2
Force and energy
1
Harvesting machinery
2
Labor
1
Mathematics
1
Tobacco -- Harvesting
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16
Tobacco -- Research
5
Tobacco curing
6
Tobacco industry
5
Tobacco use -- Health aspects
2