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Tobacco -- Research
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477
Agricultural engineering
53
Agricultural machinery
18
Freeze-drying
18
Tobacco -- Harvesting
17
Tobacco curing
17
Tobacco industry
17
Farm mechanization
12
Agricultural mechanics
8
Tobacco -- Experiments
8
Agricultural experiment stations
7
Agriculture -- Research
6
Harvesting machinery
5
Statistics
5
Tobacco use -- Health aspects
5
Farm equipment
4
Flue-cured tobacco
4
Plants
4
Tobacco
4
Agricultural engineers
3