Subject
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Pesticides
5
Pests
10
Pheromones
1
Pine
4
Pines
1
Planning
1
Plant cells and tissues
1
Plantations
3
Planting
2
Plants, Effect of acid precipitation on
1
Plants, Effect of herbicides on
1
Plants, Effect of light on
1
Ponds
1
Poplar
4
Population
1
Populations
1
Preparation of
1
Prevention and control
5
Provenance trials
4
Pruning
1
Public opinion
1
Pulp and Paper industry
1
Pulpwood industry
1
Pyrethroids
1
Quality
1
Rain-making
1
Red maple
1
Red pine
2
Red spruce
3
Reforestation
7
Regeneration
1
Research
4
Reservations
1
Residues
1
Resource management
1
Rivers
1
Roads
1
Root rot
1
Root rots
1
Rust fungi
1
Safety
1
Safety education
1
Sawing
1
Sawmills
2
Seed orchards
2
Seedlings
5
Seedlings, Container
1
Seeds
6
Selection (Plant breeding)
1
Shade trees
1
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