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Agriculture -- Research
5
Aerial spraying and dusting in agriculture
4
Agricultural engineering
4
Pesticides
4
Pests -- Control
4
Agricultural machinery
3
Agriculture -- Economic aspects
3
Federal aid to research
3
Cotton -- Diseases and pests
2
Crops
1
Exchange of persons programs
1
Farm equipment
1
Livestock
1
Spraying equipment
1
Sunflowers -- Research
1
Tobacco -- Diseases and pests
1