BILDPOSTKARTE Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 20.12.1905
BILDPOSTKARTE Bos-Vernet, Clara Author: Bos-Vernet, Clara Recipient: Haeckel, Ernst Dating: 17.12.1905
BILDPOSTKARTE Engelmann, Theodor Wilhelm; Engelmann, Emma Author: Engelmann, Theodor Wilhelm; Engelmann, Emma Recipient: Haeckel, Ernst Dating: 31.12.1905
BILDPOSTKARTE Haeckel, Walther; Haeckel, Josefa Author: Haeckel, Walther; Haeckel, Josefa Recipient: Haeckel, Ernst; Haeckel, Agnes [Eltern] Dating: 17.08.1905
BILDPOSTKARTE Meyer, Gertrud und Else Author: Meyer, Gertrud und Else Recipient: Haeckel, Ernst Dating: 31.12.1905