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Agricultural engineering
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172
Tobacco -- Research
53
Agricultural machinery
32
Agriculture -- Research
31
Tobacco curing
23
Farm mechanization
21
Tobacco -- Harvesting
17
Tobacco
13
Pesticides
12
Harvesting machinery
11
Aerial spraying and dusting in agriculture
10
Patents
10
Farm equipment
8
Agricultural mechanics
7
Agriculture
7
Freeze-drying
7
Pests -- Control
7
Agricultural laboratories
6
Agriculture -- Economic aspects
6
Federal aid to research
5
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