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Agricultural engineering
2
Agricultural machinery
2
Pesticides
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2
Aerial spraying and dusting in agriculture
1
Agricultural extension work
1
Agriculture -- Economic aspects
1
Agriculture -- Research
1
Cotton -- Diseases and pests
1
Farm mechanization
1
Federal aid to research
1
Fertilizers
1
Fungicides
1
Harvesting machinery
1
Pests -- Control
1
Rheology
1
Vegetables -- Harvesting
1
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