BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 13.05.1875
BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 09.01.1876
BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 23.02.1876
BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 28.05.1876
BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 22.05.1877
BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 18.02.1878
BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 19.07.1878
BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 28.05.1880
BRIEF [O.A.] Koch, Gottlieb von Author: Koch, Gottlieb von Recipient: Haeckel, Ernst Dating: 03.08.1882
