ANSICHTSKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Delle Grazie, Marie Eugenie Dating: 30.12.1896
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