BRIEF [O.A.] ...lemann, Theodor Author: ...lemann, Theodor Recipient: Haeckel, Ernst Dating: 10.04.1905
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