BRIEF [O.A.] Buttel-Reepen, H... von Author: Buttel-Reepen, H... von Recipient: Haeckel, Ernst Dating: 11.08.1907
BRIEF [O.A.] Buttel-Reepen, H... von Author: Buttel-Reepen, H... von Recipient: Haeckel, Ernst Dating: 03.12.1907