TELEGRAMM Heldburg, Helene Freifrau von Author: Heldburg, Helene Freifrau von Recipient: Haeckel, Ernst Dating: 16.02.1918
TELEGRAMM Heldburg, Helene Freifrau von Author: Heldburg, Helene Freifrau von Recipient: Haeckel, Ernst Dating: 30.08.1918
TELEGRAMM Ernst [Prinz von Sachsen-Altenburg] [?] Author: Ernst [Prinz von Sachsen-Altenburg] [?] Recipient: Haeckel, Ernst Dating: 16.02.1918