“…spruce (Picea abies), balsam fir (Abies balsamea), Douglas fir (Pseudotsuga menziesii), beech (Fagus sylvatica), red alder (Alnus rubra), cottonwood (Populus trichocarpa) (Arseneau 1961;Sandermann, Augustin 1963;Kosik et al 1968b;Chow, Pickles 1971;Shafizadeh, McGinnis 1971). This method was applied on several wood species, e.g.…”