BILDPOSTKARTE Hinderdael, Irmgard van Author: Hinderdael, Irmgard van Recipient: Haeckel, Ernst Dating: 16.02.1914
TELEGRAMM Sethe-Seyberth, Louise; Sethe, Walter Author: Sethe-Seyberth, Louise; Sethe, Walter Recipient: Haeckel, Ernst Dating: 15.02.1914