BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 06.10.1866
VISITENKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 1907.??.?? [davor]
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 13.11.1868
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 08.01.1870
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 17.03.1870
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 05.10.1874
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 05.10.1884
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 22.06.1884
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Fischer, Kuno Dating: 30.06.1886