BRIEF OHNE UMSCHLAG Eggeling, Heinrich von Author: Eggeling, Heinrich von Recipient: Haeckel, Ernst Dating: 19.04.1898
BRIEF OHNE UMSCHLAG Rottenburg, Paul von Author: Rottenburg, Paul von Recipient: Haeckel, Ernst Dating: 06.08.1898
BRIEF OHNE UMSCHLAG Kükenthal, Willy Author: Kükenthal, Willy Recipient: Haeckel, Ernst Dating: 14.03.1898
BRIEF OHNE UMSCHLAG Kükenthal, Willy Author: Kükenthal, Willy Recipient: Haeckel, Ernst Dating: 21.03.1898
BRIEF OHNE UMSCHLAG Schneider, Gustav Author: Schneider, Gustav Recipient: Haeckel, Ernst Dating: 28.11.1898
BRIEF OHNE UMSCHLAG Schneider, Gustav Author: Schneider, Gustav Recipient: Haeckel, Ernst Corporation: Zoologisches Institut Basel Dating: 18.11.1898