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Agricultural engineering
19
Agricultural machinery
5
Agriculture
1
Agriculture -- Research
1
Automation -- Human factors
1
Biological assay
1
Business travel
2
Cigars
1
Design -- Human factors
1
Dyes and dyeing -- Cotton
1
Farm equipment
2
Farm mechanization
3
Finance
1
Freeze-drying
13
Growth (Plants)
2
Harvesting machinery
1
Human engineering
1
Lifting and carrying
1
Plants
2
Plants -- Measurement
2