BRIEF OHNE UMSCHLAG Gandtner, Otto Author: Gandtner, Otto Recipient: Haeckel, Ernst Dating: 16.02.1891
BRIEF OHNE UMSCHLAG Gandtner, Otto Author: Gandtner, Otto Recipient: Haeckel, Ernst Dating: 07.12.1891
BRIEF [O.A.] Gaedechens, Rudolph Author: Gaedechens, Rudolph Recipient: Haeckel, Ernst Dating: 13.02.1891
BRIEF [O.A.] Gelzer, Heinrich Author: Gelzer, Heinrich Recipient: Haeckel, Ernst Corporation: Universität Jena, Philosophische Fakultät Dating: 21.07.1891
BRIEF OHNE UMSCHLAG Giltsch, Adolf Author: Giltsch, Adolf Recipient: Haeckel, Ernst Dating: 10.09.1891