BRIEF [O.A.] Kieser, Wilhelmine Author: Kieser, Wilhelmine Recipient: Haeckel, Ernst Dating: 09.07.1909
BRIEF [O.A.] Kieser, Wilhelmine Author: Kieser, Wilhelmine Recipient: Haeckel, Ernst Dating: 16.08.1909
BRIEF [O.A.] Kieser, Wilhelmine Author: Kieser, Wilhelmine Recipient: Haeckel, Ernst Dating: 22.08.1909