BRIEF [O.A.] Kellermann, Carl Alfred Author: Kellermann, Carl Alfred Recipient: Haeckel, Ernst Dating: 30.08.1906
BRIEF [O.A.] Buttel-Reepen, H... von Author: Buttel-Reepen, H... von Recipient: Haeckel, Ernst Dating: 15.11.1904
BRIEF [O.A.] Buttel-Reepen, H... von Author: Buttel-Reepen, H... von Recipient: Haeckel, Ernst Dating: 19.11.1906
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
BRIEF [O.A.] Buttel-Reepen, H... von Author: Buttel-Reepen, H... von Recipient: Haeckel, Ernst Dating: 19.08.1908
BRIEF [O.A.] Buttel-Reepen, H... von Author: Buttel-Reepen, H... von Recipient: Haeckel, Ernst Dating: 24.08.1914
BRIEF [O.A.] Schwartz, A... Author: Schwartz, A... Recipient: Haeckel, Ernst Corporation: Schulzesche Hof-Buchhandlung Dating: 06.04.1876
BRIEF [O.A.] Schwartz, A... Author: Schwartz, A... Recipient: Haeckel, Ernst Corporation: Schulzesche Hof-Buchhandlung Dating: 28.12.1874