ANSICHTSKARTE Kölliker, Albert von Author: Kölliker, Albert von Recipient: Haeckel, Ernst Dating: ??.??.1896
ANSICHTSKARTE Haeckel, Siegfried Author: Haeckel, Siegfried Recipient: Haeckel, Ernst Dating: 14.02.1909
ANSICHTSKARTE Oppenheim, Louise Author: Oppenheim, Louise Recipient: Haeckel, Ernst Dating: 16.02.1909
ANSICHTSKARTE Lother, Friedrich Author: Lother, Friedrich Recipient: Haeckel, Ernst Dating: 14.02.1914