BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Dating: 27.04.1915
BRIEF OHNE UMSCHLAG Haeckel, Walter Author: Haeckel, Walter Recipient: Heldburg, Helene Freifrau von Dating: 24.08.1919
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Dating: 17.01.1898
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Dating: 08.07.1897
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Dating: 09.07.1897
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Dating: 10.07.1897
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Dating: 16.12.1897
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Dating: 17.02.1892
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Corporation: Zoologisches Institut Dating: 01.01.1899
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Heldburg, Helene Freifrau von Corporation: Zoologisches Institut Dating: 21.02.1899