BILLET Schleicher, August Author: Schleicher, August Recipient: Haeckel, Ernst; Haeckel, Anna Dating: 29.10.1863
BRIEF OHNE UMSCHLAG Focke, Wilhelm Olbers Author: Focke, Wilhelm Olbers Recipient: Haeckel, Ernst Dating: 22.04.1863
BRIEF [O.A.] Gierlichs, Florentine Author: Gierlichs, Florentine Recipient: Haeckel, Ernst Dating: 03.12.1863
BRIEF [O.A.] Gessenhardt, Johann Author: Gessenhardt, Johann Recipient: Haeckel, Ernst Dating: 21.05.1863
BRIEF OHNE UMSCHLAG Keferstein, Wilhelm Author: Keferstein, Wilhelm Recipient: Haeckel, Ernst Dating: 07.03.1863
BRIEF OHNE UMSCHLAG Keferstein, Wilhelm Author: Keferstein, Wilhelm Recipient: Haeckel, Ernst Dating: 05.07.1863
BRIEF OHNE UMSCHLAG Keferstein, Wilhelm Author: Keferstein, Wilhelm Recipient: Haeckel, Ernst Dating: 19.12.1863
