BRIEF [O.A.] Haeckel, Anna Author: Haeckel, Anna Recipient: Charlotte Haeckel, Carl Gottlob Haeckel Dating: 29.10.1863
BRIEF [O.A.] Haeckel, Anna; Haeckel, Ernst Author: Haeckel, Anna; Haeckel, Ernst Recipient: Haeckel, Charlotte; Haeckel, Carl Gottlob Dating: 23.12.1863
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl & Charlotte [Eltern] Dating: 20.11.1863