BRIEF [O.A.] Koehler, Woldemar Author: Koehler, Woldemar Recipient: Haeckel, Ernst Dating: 15.02.1910
BRIEF [O.A.] Koehler, Woldemar Author: Koehler, Woldemar Recipient: Haeckel, Ernst Dating: 09.08.1910
BRIEF [O.A.] Kutzschenbach, Arthur von Author: Kutzschenbach, Arthur von Recipient: Haeckel, Ernst Dating: 31.12.1910
BRIEF [O.A.] Koehler, Woldemar Author: Koehler, Woldemar Recipient: Haeckel, Ernst Dating: 14.09.1910
BRIEF [O.A.] Koehler, Woldemar Author: Koehler, Woldemar Recipient: Haeckel, Ernst Dating: 18.08.1910
BRIEF [O.A.] Koehler, Woldemar Author: Koehler, Woldemar Recipient: Haeckel, Ernst Dating: 19.08.1910
