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Two factors determine the available sizes of softwoods and hardwoods: the size of the trees from which they are cut and the range of internationally agreed sawn sizes, which are set out in British Standards. With the development of forest management programmes, more trees are felled once they have reached a usable economic size; f ewer trees are left to reach their full height and girth. Long lengths (more than about six metres for softwood and perhaps five to six metres for some hardwoods) ...

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