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Soil conservation
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50
Crop science
14
Terracing
11
Farms
7
Agricultural extension work
6
Forests and forestry
5
Agricultural machinery
3
Black locust
3
Loblolly pine (Pinus taeda)
3
Soil erosion
3
Agricultural education
2
Agricultural exhibitions
2
Congresses and conventions
2
Nurseries (Horticulture)
2
Plowing
2
Teaching demonstrations
2
Trees -- Seedlings
2
Water conservation
2
4-H clubs -- Periodicals
1
African American farmers
1
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