TELEGRAMM Krauseneck, Heinrich Author: Krauseneck, Heinrich Recipient: Haeckel, Ernst Dating: 12.12.1889
Krauseneck, Gustav Adolf; Krauseneck, Olga Author: Krauseneck, Gustav Adolf; Krauseneck, Olga Recipient: Haeckel, Ernst Dating: 12.12.1889
TELEGRAMM Lutteroth, Emma von Author: Lutteroth, Emma von Recipient: Haeckel, Ernst Dating: 16.02.1894
