TELEGRAMM Heldburg, Helene Freifrau von Author: Heldburg, Helene Freifrau von Recipient: Haeckel, Ernst Dating: 14.11.1889
TELEGRAMM Sachsen-Meiningen, Georg II. Herzog von Author: Sachsen-Meiningen, Georg II. Herzog von Recipient: Haeckel, Ernst Dating: 12.05.1889
TELEGRAMM Krauseneck, Heinrich Author: Krauseneck, Heinrich Recipient: Haeckel, Ernst Dating: 12.12.1889