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Forestry extension workers
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148
Forest management
74
Forest thinning
41
Agricultural extension work
40
Farmers
32
Forests and forestry
29
Teaching demonstrations
22
Loblolly pine (Pinus taeda)
16
Trees -- Measurement
16
Timber
15
Shortleaf pine (Pinus echinata)
12
Pine
11
4-H clubs
10
Farms
8
Longleaf pine (Pinus palustris)
8
Signs and signboards
8
Trees
8
Forests and forestry -- North Carolina
7
Foresters
6
Eastern black walnut
5
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