Trees 4 Breeding 3 Crown lands 3 Management 3 Afforestation 2 Control 2 Forest insects 2 Forest management 2 Forests and forestry 2 Growth 2 Hardwoods 2 Public lands 2 Research 2 Spruce budworm 2 Bacillus thuringiensis 1 Behavior 1 Biological control 1 Carbon sequestration 1 Color 1 Conifers Continental drift 1 Continents 1 Forest ecology 1 Forest genetics 1 Forest management plans 1 Forest monitoring 1 Forest reserves 1 Forest restoration 1 Forest soils 1 Grading 1 Habitat 1 Herbivores 1 Identification 1 Insecticides 1 Land grants 1 Law and legislation 1 Lumber 1 Measurement 1 Natural resources 1 Planning 1 Quercus rubra 1 Recreational use 1 Reforestation 1 Softwoods 1 Timber 1 Tree-rings 1 Ungulates 1 Wilderness areas 1 Wood 1 Yields 1