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Acid rain
2
Aerial spraying and dusting in forestry
7
Agricultural productivity
1
Air -- Pollution
1
Aspen
1
Atlantic white cedar
3
Baldcypress
2
Bark peeling
1
Biotechnology
1
Black cherry
3
Black locust
5
Branches (Plant components)
1
Brush -- Control
3
Budding (Plant propagation)
2
Chain saws
1
Chemicals
1
Chemistry
1
Clay soils
2
Climbing plants
1
Clones (Plants) Selection
4