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Agricultural machinery
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9
Pests -- Control
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9
Pesticides
6
Agricultural engineering
5
Agriculture -- Research
5
Aerial spraying and dusting in agriculture
4
Agriculture -- Economic aspects
4
Federal aid to research
4
Cotton -- Diseases and pests
3
Blueberries
2
Farm mechanization
2
Tractors
2
Agriculture
1
Fungicides
1
Potatoes
1
Spraying equipment
1
Tobacco -- Diseases and pests
1
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