POSTKARTE Finsterbusch, Ludwig Author: Finsterbusch, Ludwig Recipient: Haeckel, Ernst Dating: 17.08.1885
POSTKARTE Möbius, Karl Author: Möbius, Karl Recipient: Haeckel, Ernst Corporation: Zoologisches Museum der Universität Kiel Dating: 12.09.1885
POSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte [Mutter] Dating: 12.08.1885