ANSICHTSKARTE Busch, Marie, geb. Ebhardt Author: Busch, Marie, geb. Ebhardt Recipient: Haeckel, Ernst Dating: 15.02.1914
ANSICHTSKARTE Meyer, Hans et. al. Author: Meyer, Hans et. al. Recipient: Haeckel, Ernst Dating: 31.01.1904
ANSICHTSKARTE Friedrich, Gustav Author: Friedrich, Gustav Recipient: Haeckel, Ernst Dating: 15.02.1909