VISITENKARTE Altmann-Bronn, Ida Author: Altmann-Bronn, Ida Recipient: Haeckel, Ernst Dating: 16.02.1913
VISITENKARTE Ishikawa, Chiyomatsu Author: Ishikawa, Chiyomatsu Recipient: Haeckel, Ernst Dating: vor 12.02.1909
VISITENKARTE Altmann-Bronn, Ida Author: Altmann-Bronn, Ida Recipient: Haeckel, Ernst Dating: ??.12.1916
VISITENKARTE Adler, Moritz (1831 - 1907) Author: Adler, Moritz (1831 - 1907) Recipient: Haeckel, Ernst Dating: 28.02.1894