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Entomology
9
Soybean -- Research
9
Tobacco industry
9
Agricultural extension work
7
Agriculture -- Economic aspects
7
Pests -- Control
7
Tobacco
7
Agronomy
6
Continuing education
6
Crops -- Certification
6
Freeze-drying
6
Nuclear engineering
6
Soybean
6
Tobacco -- Harvesting
6
Tobacco curing
6
Aerial spraying and dusting in agriculture
5
Agricultural chemistry
5
Federal aid to research
5
Harvesting machinery
5
Nuclear engineering -- Education
5