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Agricultural machinery
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77
Agricultural engineering
32
Tobacco -- Research
18
Agriculture -- Research
13
Tobacco -- Harvesting
12
Agricultural mechanics
8
Tobacco curing
8
Agriculture -- Economic aspects
7
Pesticides
6
Tobacco
6
Aerial spraying and dusting in agriculture
5
Pests -- Control
5
Vibration
5
Farm mechanization
4
Federal aid to research
4
Fertilizers
4
Patents
4
Contracts
3
Cotton -- Diseases and pests
3
Harvesting machinery
3