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Roots (Botany)
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23
Forest management
6
Forestry laboratories
4
Forest fires -- Environmental aspects
3
Longleaf pine (Pinus palustris)
3
Stumpwood
3
Trees
3
Agricultural extension work
2
Birch
2
Forests and forestry
2
Growth (Plants)
2
Rocks
2
Soil erosion
2
Agricultural engineering
1
Brickwork
1
Bulldozers
1
Clearing of land
1
College campuses
1
Cottonwood
1
Ecology
1