PORTRÄTPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 16.09.1913
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 09.12.1913
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 09.01.1915
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: ??.??.1915
PORTRÄTPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 26.02.1913
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 15.06.1915