BRIEF OHNE UMSCHLAG Strasburger, Eduard Author: Strasburger, Eduard Recipient: Haeckel, Ernst Dating: 22.12.1886
POSTKARTE Recipient: Haeckel, Ernst Corporation: Administration der neuen Zürcher Zeitung Dating: 09.09.1886
BRIEF [O.A.] Gumprecht, Ferdinand Author: Gumprecht, Ferdinand Recipient: Haeckel, Ernst Dating: 01.04.1886
BRIEF [O.A.] Littrow, Heinrich von Author: Littrow, Heinrich von Recipient: Haeckel, Ernst Dating: 07.05.1886
BRIEF [O.A.] Fürbringer, Paul Author: Fürbringer, Paul Recipient: Haeckel, Ernst Corporation: Medicinisch-Naturwissenschaftl. Gesellschaft zu Jena Dating: 07.02.1886
BRIEF [O.A.] Vogel, Hermann Wilhelm Author: Vogel, Hermann Wilhelm Recipient: Haeckel, Ernst Dating: 27.04.1886
BRIEF [O.A.] Schneider, G... H... Author: Schneider, G... H... Recipient: Haeckel, Ernst Dating: 15.05.1886