BRIEF [O.A.] Stichling, Gottfried Theodor von Author: Stichling, Gottfried Theodor von Recipient: Haeckel, Ernst Dating: 21.05.1881
BRIEF [O.A.] Stichling, Gottfried Theodor von Author: Stichling, Gottfried Theodor von Recipient: Haeckel, Ernst Dating: 16.02.1881
BRIEF [O.A.] Stichling, Gottfried Theodor von Author: Stichling, Gottfried Theodor von Recipient: Haeckel, Ernst Dating: 25.07.1881