BRIEF [O.A.] Kopetzky, Hermine Author: Kopetzky, Hermine Recipient: Haeckel, Ernst Dating: 30.10.1917
BRIEF [O.A.] Kopetzky, Hermine Author: Kopetzky, Hermine Recipient: Haeckel, Ernst Dating: 12.11.1917
BRIEF [O.A.] Kopetzky, Hermine Author: Kopetzky, Hermine Recipient: Haeckel, Ernst Dating: 13.12.1917