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Agricultural machinery
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108
Agricultural engineering
34
Tobacco -- Research
18
Harvesting machinery
17
Agriculture -- Research
16
Cucumbers
13
Tobacco -- Harvesting
13
Harvesting
11
Agriculture -- Economic aspects
9
Tobacco curing
9
Agricultural mechanics
8
Pesticides
8
Tobacco
7
Fertilizers
6
Pests -- Control
6
Aerial spraying and dusting in agriculture
5
Hay
5
Pickles
5
Vibration
5
Farm mechanization
4