BRIEF OHNE UMSCHLAG Vetter, Benjamin Author: Vetter, Benjamin Recipient: Haeckel, Ernst Dating: 02.01.1889
BRIEF OHNE UMSCHLAG Vetter, Benjamin Author: Vetter, Benjamin Recipient: Haeckel, Ernst Dating: 14.02.1889
BRIEF OHNE UMSCHLAG Vetter, Benjamin Author: Vetter, Benjamin Recipient: Haeckel, Ernst Dating: 08.01.1889
BRIEF OHNE UMSCHLAG Karo, Adalbert Author: Karo, Adalbert Recipient: Haeckel, Ernst Dating: 14.02.1889