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Agricultural engineering
91
Tobacco -- Research
60
Agriculture -- Research
28
Agricultural machinery
23
Persons
20
Tobacco curing
17
Freeze-drying
16
Tobacco -- Harvesting
14
Tobacco industry
14
Parties
13
Agricultural mechanics
8
Farm mechanization
8
Farm equipment
7
Harvesting machinery
6
Plants
6
Agriculture
5
Tobacco
5
Agricultural engineers
4
Agricultural experiment stations
4
Agricultural education
3