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Fertilizers
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15
Agronomy
6
Agricultural extension work
2
Agriculture -- Research
2
Crop science
2
Flue-cured tobacco
2
Teaching demonstrations
2
Aerial spraying and dusting in agriculture
1
Agriculture -- Experimentation
1
Boats and boating
1
Calves
1
Cattle -- Feeding and feeds
1
Dairy cattle
1
Farm mechanization -- North Carolina
1
Limestone
1
Pastures
1
Plows
1
Potatoes
1
Railroad trains
1
Soil fertility -- North Carolina
1