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