BRIEF MIT UMSCHLAG Scherzer, Ritter Karl von Author: Scherzer, Ritter Karl von Recipient: Haeckel, Ernst Dating: 30.12.1883
BRIEF [O.A.] Schiattarella, Raffaele Author: Schiattarella, Raffaele Recipient: Haeckel, Ernst Dating: 16.09.1883
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Krauseneck, Heinrich Dating: 24.02.1883
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Krauseneck, Heinrich Dating: 20.07.1883
BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Krauseneck, Heinrich Dating: 30.12.1883
