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Soil science -- Research
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26
Agricultural experiment stations
18
Agriculture -- Research
18
Botanists
2
Forestry laboratories
2
Agriculture -- Economic aspects
1
Bogs
1
Fertilizers -- North Carolina -- Analysis
1
Flue-cured tobacco
1
Loam soils
1
Loblolly pine (Pinus taeda)
1
Sandy loam soils
1
Savannas
1
Soil conservation
1
Soil erosion
1
Soil management
1
Soils
1
Soils -- Sampling
1
Tobacco -- Experiments
1
Tobacco -- Research
1