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Pesticides
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89
Pests -- Control
15
Agricultural engineering
12
Agriculture -- Research
11
Aerial spraying and dusting in agriculture
9
Agricultural machinery
8
Continuing education
8
Entomology
8
Meetings
8
Spraying equipment
8
Agricultural chemistry
7
Agricultural education
6
Peas
6
Agriculture -- Economic aspects
5
Cotton -- Diseases and pests
5
Crop science
5
Federal aid to research
5
Magnesium
5
Agricultural experiment stations
4
Crops
4
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