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Spraying and dusting in agriculture
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20
Pesticides
5
Spraying equipment
5
Crops
4
Entomology
4
Field crops
4
4-H clubs -- Membership
2
Agricultural experiment stations
2
Agriculture
2
Agriculture -- Research
2
Boll weevil
2
Cotton -- Diseases and pests
2
Farmers
2
Magnesium
2
Peas
2
Pumping machinery
2
Tractors
2
African Americans -- History
1
Agricultural engineering
1
Agricultural extension work
1