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Agricultural engineering
11
Agricultural engineers
1
Agricultural experiment stations
1
Agricultural machinery
11
Agricultural mechanics
8
Agriculture -- Research
1
Automation -- Human factors
1
Burley tobacco
1
Business travel
2
Design -- Human factors
1
Editing
1
Farm mechanization
2
Freeze-drying
2
Harvesting machinery
2
Human engineering
1
Lifting and carrying
1
Scientific apparatus and instruments
1
Tobacco -- Harvesting
5
Tobacco -- Research
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21
Tobacco curing
7