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acres Agriculture annual Association Australia basal area bole boron branches Britain British British Honduras caribaea cent Commonwealth Forestry Association Commonwealth Forestry Institute cones conifers costs countries crop decay resistance deep planting density die-back Dothistroma Douglas fir economic effect Eucalyptus experiments feet fibres fire Forest Department forest manager Forest Products Forest Research Forest Service Forestry Commission Forestry Conference fuel yield girth growing hardwoods heartwood height growth height increment important inches increase industry land Lodgepole pine logs measure ment methods mill million mushitu Nigeria Norway spruce nursery organisation Oxford paper pine Pinus Pinus radiata plantations plots present problems programme protection pruning pulp pulpwood radiata rainfall region requirements root sample savanna sawmill seed seedlings Shade silvicultural Sitka spruce softwood soil species stem Table tests thinning timber tracheids treatment trees tropical Uganda utilisation vegetation volume Wallaba white spruce wood woodland