PORTRÄTPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 17.01.1905
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 08.06.1905
PORTRÄTPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 1905.06.?? [?]
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Corporation: Zoologisches Institut der Universität Jena Dating: 27.01.1907
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Corporation: Zoologisches Institut der Universität Jena Dating: 22.01.1908
PORTRÄTPOSTKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 17.08.1910
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Altmann-Bronn, Ida Dating: 11.06.1911