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Tobacco -- Research
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522
Agricultural engineering
54
Tobacco curing
19
Tobacco industry
19
Agricultural machinery
18
Freeze-drying
18
Tobacco -- Harvesting
17
Farm mechanization
12
Agricultural experiment stations
8
Agricultural mechanics
8
Chemistry -- Research
8
Congresses and conventions
8
Tobacco -- Experiments
8
Agriculture -- Research
7
Tobacco
6
Harvesting machinery
5
Statistics
5
Tobacco use -- Health aspects
5
Crop science
4
Farm equipment
4
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