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Agricultural engineering
6
Pesticides
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6
Aerial spraying and dusting in agriculture
5
Agricultural machinery
5
Agriculture -- Economic aspects
5
Agriculture -- Research
5
Federal aid to research
5
Pests -- Control
5
Cotton -- Diseases and pests
4
Agricultural experiment stations
1
Agricultural extension work
1
Agricultural facilities
1
Farm mechanization
1
Fertilizers
1
Fungicides
1
Harvesting machinery
1
Heptachlor
1
Rheology
1
Tobacco -- Diseases and pests
1
Vegetables -- Harvesting
1
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