"Continuation of the author's monographs 'Identification of living gymnosperms on the basis of xylotomy' and 'Xylotomische Bestimmung der heute lebend...
"Continuation of the author's monographs 'Identification of living gymnosperms on the basis of xylotomy' and 'Xylotomische Bestimmung der heute lebenden Gymnospermen.'"