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Agricultural engineering
179
Agriculture -- Research
116
Tobacco -- Research
108
Plants -- Research
85
Agricultural machinery
78
Pesticides
52
Tobacco curing
48
Meetings
47
Tobacco -- Harvesting
47
Crop science
46
Entomology
41
Horticulture
40
Agricultural experiment stations
37
Agriculture -- Economic aspects
37
Associations, institutions, etc.
34
Research grants
34
Contracts
33
Farm mechanization
32
Tobacco industry
30
Tobacco
27