ANSICHTSKARTE Eggeling, Heinrich von Author: Eggeling, Heinrich von Recipient: Haeckel, Ernst Dating: 30.12.1903
ANSICHTSKARTE Duncan, Elizabeth; Sturges, Mary Estelle; Merz, Max Author: Duncan, Elizabeth; Sturges, Mary Estelle; Merz, Max Recipient: Haeckel, Ernst Dating: 12.11.1908
ANSICHTSKARTE Meyer, Hans et. al. Author: Meyer, Hans et. al. Recipient: Haeckel, Ernst Dating: 31.01.1904