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agriculture annual Association Australia Bexhill-on-Sea Britain Canada caribaea Caribbean pine cent Committee Commonwealth Forestry Association Commonwealth Forestry Review conifers conservation cost crop density developing countries disease Douglas fir drying ecological economic effect established eucalypts export fertilizer Fiji fire forest industries forest management forest products Forest Research forest resources Forest Service Forestry Commission fuel fuelwood Gambia genetic Gmelina grass grazing growth hardwoods HARRY CHAMPION important increase Institute interest International KEBLE ROAD kiln land logging Maningrida million Nigeria operations Oxford P.O. Box paper pine Pinus Pinus caribaea planning plantations planting plots present problems programme pruning pulp radiata red fescue region Road savanna second rotation seed seedlings silviculture softwood soil species stand technical thinning timber top height trees trials tropical forest tropical hardwoods volume wood woodland Zealand