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Agricultural engineering
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960
Tobacco -- Research
54
Agricultural machinery
35
Agriculture -- Research
32
Tobacco curing
23
Farm mechanization
21
Tobacco -- Harvesting
18
Tobacco
13
Harvesting machinery
12
Pesticides
12
Aerial spraying and dusting in agriculture
10
College buildings
10
Patents
10
Agriculture
9
Farm equipment
8
Agricultural mechanics
7
Agriculture -- Economic aspects
7
Freeze-drying
7
Pests -- Control
7
Agricultural laboratories
6