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Crop yields
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23
Corn
4
Cotton
4
Peanuts
4
Tobacco
4
Tobacco curing
4
Agronomy
3
Tobacco industry -- North Carolina
3
Crops
2
Field crops -- Varieties -- North Carolina
2
Soybean
2
Tobacco -- Harvesting
2
African American farmers
1
Agricultural experiment stations
1
Agricultural productivity
1
Agriculture -- Economic aspects
1
Contests
1
Corn -- Growth
1
Corn -- Yields
1
Cotton -- Experiments
1
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