VISITENKARTE Waldthausen, Julius Freiherr von Author: Waldthausen, Julius Freiherr von Recipient: Haeckel, Ernst; Haeckel, Karl Dating: 24.02.1889
VISITENKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Focke, Wilhelm Olbers Dating: 05.03.1906
VISITENKARTE Recipient: Haeckel, Ernst Corporation: K.K. Priv. Böhmische Union-Bank Dating: 31.10.1907
VISITENKARTE Walther, Johannes Author: Walther, Johannes Recipient: Haeckel, Ernst Dating: 31.12.1882
VISITENKARTE Walther, Johannes; Walther, Frau Author: Walther, Johannes; Walther, Frau Recipient: Haeckel, Ernst
VISITENKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Günther, Albert Carl Ludwig Gotthilf Dating: 28.02.1889
