BRIEF [O.A.] Harnier, Eduard von Author: Harnier, Eduard von Recipient: Haeckel, Ernst Dating: 21.04.1886
BRIEF [O.A.] Harnier, Eduard von Author: Harnier, Eduard von Recipient: Haeckel, Ernst Dating: 07.06.1886
BRIEF [O.A.] Harnier, Eduard von Author: Harnier, Eduard von Recipient: Haeckel, Ernst Dating: 24.06.1886
BRIEF [O.A.] Reichenbach, Heinrich Author: Reichenbach, Heinrich Recipient: Haeckel, Ernst Corporation: Senckenbergische Naturforschende Gesellschaft Dating: 03.07.1886