BRIEF [O.A.] Goerwitz, Hermann Author: Goerwitz, Hermann Recipient: Haeckel, Ernst Dating: 10.03.1881
BRIEF [O.A.] Goerwitz, Hermann Author: Goerwitz, Hermann Recipient: Haeckel, Ernst Dating: 01.06.1881
BRIEF [O.A.] Goerwitz, Hermann Author: Goerwitz, Hermann Recipient: Haeckel, Ernst Dating: 09.06.1881