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Agriculture -- Economic aspects
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426
Sociology, Rural
27
Agriculture -- Research
24
Agriculture -- North Carolina
11
Agricultural machinery
10
Farmers
10
Tobacco
8
Agricultural engineering
7
Agricultural experiment stations
6
Farm mechanization
6
Aerial spraying and dusting in agriculture
5
Agricultural extension work
5
Federal aid to research
5
Pesticides
5
Pests -- Control
5
Cotton
4
Cotton -- Diseases and pests
4
Grain
4
Agricultural administration
3
Agricultural education
3
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