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acres afforestation Africa Agriculture Annual Report Association Australia average B.Sc bark British British Guiana canopy cent coefficients of variation Colonial Conservator coppice cost crop Crown cubic feet cultivation Cupressus sempervirens Cyprus East economic Editorial Empire Forestry eucalypts export felling fire Forest Department forest management forest officers Forestry Commission girth Government grass grazing growing growth hardwoods height important inches increase industry insects interest Kenya land light lignotubers logs Malaya mallet measured ment methods metres mill Miscellanea moisture natural regeneration Nigeria nursery operations pine Pinus plantations planting plots present problems pulp rainfall regions Research reserves Review road root sample sawmill seed seedlings silvicultural softwood soil South species square miles supply Table Tanganyika tannin teak thinnings timber Timber Trades transpiration treatment trees tropical Uganda variation vegetation wattle wood woodland yield