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Pesticides
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7
Pests -- Control
7
Aerial spraying and dusting in agriculture
6
Agricultural engineering
6
Agriculture -- Research
6
Agriculture -- Economic aspects
5
Federal aid to research
5
Agricultural machinery
4
Cotton -- Diseases and pests
4
Agricultural experiment stations
1
Agricultural facilities
1
Crops
1
Entomology
1
Farm equipment
1
Farm mechanization
1
Fungicides
1
Heptachlor
1
Livestock
1
Spraying equipment
1
Statutes and codes
1
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