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Pests -- Control
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62
Pesticides
19
Insect pests -- Control -- North Carolina
15
Aerial spraying and dusting in agriculture
9
Agricultural machinery
9
Agriculture -- Research
9
Entomology
9
Agricultural engineering
7
Agriculture -- Economic aspects
5
Federal aid to research
5
Tobacco
5
Agricultural education
4
Agricultural extension work
4
Cotton -- Diseases and pests
4
Agricultural experiment stations
3
Airplanes
3
Farm mechanization
3
Meetings
3
Agricultural extension workers
2
Agriculture
2
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