BRIEF [O.A.] Haeckel, Ernst Franz Max Author: Haeckel, Ernst Franz Max Recipient: Haeckel, Ernst Dating: 15.02.1914
BRIEF [O.A.] Haeckel, Charlotte; Haeckel, Carl Gottlob; Sethe, Anna Author: Haeckel, Charlotte; Haeckel, Carl Gottlob; Sethe, Anna Recipient: Haeckel, Ernst Dating: 04.01.1860
