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Agricultural machinery
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26
Agricultural engineering
14
Tobacco -- Research
11
Agricultural mechanics
8
Vibration
4
Tobacco
3
Tobacco -- Harvesting
3
Tobacco curing
3
Defoliation
2
Agricultural engineers
1
Agricultural experiment stations
1
Agricultural facilities
1
Agricultural implements
1
Agricultural instruments
1
Agriculture -- Research
1
Angles (Geometry)
1
Automation -- Human factors
1
Design -- Human factors
1
Force and energy
1
Harvesting machinery
1