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Eggs
3
Flue-cured tobacco
3
Growth (Plants)
3
Hydraulic machinery
3
Leaves
3
Oxygen consumption (Physiology)
3
Plants -- Research
3
Tobacco industry
3
Tractors
3
Agricultural education
2
Agriculture -- Economic aspects
2
Agriculture -- Research
2
Air
2
Cigarette industry
2
Cotton
2
Crop yields
2
Curing
2
Engines
2
Equations
2
Frequencies of oscillating systems
2
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