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Agricultural engineering
4
Agricultural experiment stations
8
Agriculture -- Economic aspects
4
Agriculture -- North Carolina
1
Agriculture -- Research
16
Agronomy
1
Burley tobacco
1
Contracts
1
Farm mechanization
5
Farm mechanization -- North Carolina
1
Federal aid to research
1
Fertilizers
2
Flue-cured tobacco
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46
Labor
1
Nitrogen
1
Nitrogen fertilizers
2
Nutrient cycles
1
Politicians
1
Research grants
1
Soil management
1