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According to Girth assessments bark on main Breast-height in Inches canopy central root mass Class at Breast-height Crown Condition Crown Density Cumberland Dense Mod densely crowned trees Density in Stands development of zones directly adverse dition Douglas Fir Stands dying back dying of bark dying-back Eggesford fairly well maintained foliage density Forest Compt Girth and Crown Girth Class given in Table greater girth Green Douglas Fir heartwood Heavy Thinning height increment Hereford Holidays Hill Inclosure Inches Crown Lake Vyrnwy Log Ends loss of vigour lower roots main stems MD Devon MD MT Moderately Thin moderately thinly foliaged Number outwardly extending roots Pltg Portclair potential growth capacity Quantock reduction in foliage removed in thinning resin duct develop root condition root development root system root-system Salop signs of loss soil conditions Somerset Stands of Green tendency thinned stands Thornthwaite Traumatic Resin Ducts Trees According variety of Douglas Wythop Zone of Traumatic zones of resin