BILLET Haeckel, Ernst; Haeckel, Agnes Author: Haeckel, Ernst; Haeckel, Agnes Recipient: Verworn, Max Dating: 12.12.1889
BILLET Haeckel, Ernst; Haeckel, Agnes Author: Haeckel, Ernst; Haeckel, Agnes Recipient: Verworn, Max Dating: 30.11.????
BILLET Schleicher, August Author: Schleicher, August Recipient: Haeckel, Ernst; Haeckel, Anna Dating: 29.10.1863
BILLET Bardeleben, Karl von Author: Bardeleben, Karl von Recipient: Haeckel, Ernst Corporation: Anatomische Gesellschaft Dating: 02.06.1890
BILLET Ehrenberg, Christian Gottfried; Ehrenberg, Karoline Friederike Author: Ehrenberg, Christian Gottfried; Ehrenberg, Karoline Friederike Recipient: Haeckel, Ernst Dating: 14.12.1854
BILLET Siebold, Carl Theodor Ernst von Author: Siebold, Carl Theodor Ernst von Recipient: Haeckel, Ernst Dating: 14.02.1876