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Agricultural extension work
688
Agricultural education
100
Agriculture
84
Congresses and conventions
52
Tractors
46
Agriculture -- North Carolina
41
Agricultural exhibitions
37
Agricultural experiment stations
33
Agriculture -- Research
31
Harvesting machinery
30
Farm buildings
28
Farmers
28
Agriculture -- Economic aspects
27
Tobacco -- Research
25
Barns
23
Farm equipment
22
Farms
22
Agricultural extension workers
20
Agricultural machinery
20
Tobacco
19
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