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Section of a Tree showing its Circulation
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adhesive American annual rings appear applied average bark beech beetle birch blade Borneo branches brown rot Canada Cedar cell cavities cell walls cent centimetres centre colour commercial compression core creosote oil cross-cut cubic foot defect described develop diameter dimensions divisor Douglas fir drying durable edges Europe European face fact feet fibres figure forests fungus Gaboon glue glued grading rules grain grown hard hardwoods heartwood important inch irregularities knots length lignin lineal foot machine mahogany measurement method moisture content Obeche piece pitch pine planing plank plywood produce purposes quarter girth rays redwood referred resin result sapwood sawn Scots pine shake shrinkage side softwood species split spring spruce square standard strength suitable summer growth surface Teak teeth term texture thickness timber tissues tree trunk usually veneers vessels Walnut weight Whilst whitewood width wood cells