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Tobacco -- Research
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21
Agricultural engineering
11
Agricultural machinery
11
Agricultural mechanics
8
Tobacco curing
7
Tobacco industry
6
Tobacco -- Harvesting
5
Business travel
2
Farm mechanization
2
Freeze-drying
2
Harvesting machinery
2
Tobacco use -- Health aspects
2
Agricultural engineers
1
Agricultural experiment stations
1
Agriculture -- Research
1
Automation -- Human factors
1
Burley tobacco
1
Design -- Human factors
1
Editing
1
Human engineering
1