VISITENKARTE Altmann-Bronn, Ida Author: Altmann-Bronn, Ida Recipient: Haeckel, Ernst Dating: 16.02.1913
BRIEF OHNE UMSCHLAG Altmann-Bronn, Ida Author: Altmann-Bronn, Ida Recipient: Haeckel, Ernst Dating: 14.09.1913
BILDPOSTKARTE Altmann-Bronn, Ida Author: Altmann-Bronn, Ida Recipient: Haeckel, Ernst Dating: 26.09.1913
BRIEF OHNE UMSCHLAG Altmann-Bronn, Ida Author: Altmann-Bronn, Ida Recipient: Haeckel, Ernst Dating: 21.10.1913
BRIEF OHNE UMSCHLAG Altmann-Bronn, Ida Author: Altmann-Bronn, Ida Recipient: Haeckel, Ernst Dating: 12.11.1913