POSTKARTE Ziegler, Heinrich Ernst Author: Ziegler, Heinrich Ernst Recipient: Haeckel, Ernst Dating: 15.06.1905
POSTKARTE Pulvermacher, Th... Author: Pulvermacher, Th... Recipient: Haeckel, Ernst Dating: 14.02.1904
POSTKARTE Recipient: Haeckel, Ernst Corporation: Akademisch-Medizinischer Verein Breslau Dating: 15.11.1896