BRIEF OHNE UMSCHLAG Friedmann, Hermann Author: Friedmann, Hermann Recipient: Haeckel, Ernst Dating: 19.04.1901
BRIEF OHNE UMSCHLAG Friedmann, Hermann Author: Friedmann, Hermann Recipient: Haeckel, Ernst Dating: 11.06.1901
BRIEF OHNE UMSCHLAG Friedmann, Hermann Author: Friedmann, Hermann Recipient: Haeckel, Ernst Dating: 03.09.1901
BRIEF OHNE UMSCHLAG Friedmann, Hermann Author: Friedmann, Hermann Recipient: Haeckel, Ernst Dating: 25.09.1901
BRIEF [O.A.] Zschokke, Friedrich Author: Zschokke, Friedrich Recipient: Haeckel, Ernst Corporation: Zoologische Anstalt der Universität Basel Dating: 27.02.1899
POSTKARTE Zschokke, Friedrich Author: Zschokke, Friedrich Recipient: Haeckel, Ernst Corporation: Universität Basel Dating: 05.12.1898
POSTKARTE Zschokke, Friedrich Author: Zschokke, Friedrich Recipient: Haeckel, Ernst Corporation: Zoologische Anstalt der Universität Basel Dating: 15.05.1903
BRIEF [O.A.] Zschokke, Friedrich Author: Zschokke, Friedrich Recipient: Haeckel, Ernst Corporation: Zoologische Anstalt der Universität Basel Dating: 15.02.1904
POSTKARTE Zschokke, Friedrich Author: Zschokke, Friedrich Recipient: Haeckel, Ernst Corporation: Universität Basel Dating: 20.01.1907
POSTKARTE Zschokke, Friedrich Author: Zschokke, Friedrich Recipient: Haeckel, Ernst Dating: 16.02.1918