BRIEF OHNE UMSCHLAG Haeckel, Carl Gottlob Author: Haeckel, Carl Gottlob Recipient: Haeckel, Ernst; Haeckel, Anna Dating: 02.10.1862
BRIEF OHNE UMSCHLAG Sethe, Anna Author: Sethe, Anna Recipient: Haeckel, Charlotte; Haeckel, Ernst Dating: 26.03.1857
BRIEF OHNE UMSCHLAG Haeckel, Karl; Sethe, Wilhelmine Author: Haeckel, Karl; Sethe, Wilhelmine Recipient: Haeckel, Ernst Dating: 01.03.1859