. . "Pin États-Unis Croissance." . . "Taille (Horticulture)" . . . "The pruning of young trees in sparsely and unevenly stocked stands will greatly improve the resulting lumber grades. In northern white and red pines, even in fully stocked stands, artificial pruning is essential for the production of any of the best grades of lumber in a reasonable time."@en . . . . . "Knots in second-growth pine and the desirability of pruning" . "Knots in second-growth pine and the desirability of pruning"@en . . . . . .