BRIEF OHNE UMSCHLAG Schenk, August Author: Schenk, August Recipient: Haeckel, Ernst Dating: 29.12.1868
BRIEF OHNE UMSCHLAG Eimer, Theodor Author: Eimer, Theodor Recipient: Haeckel, Ernst Dating: 08.10.1893
BRIEF OHNE UMSCHLAG Jacobs, Rudolf Author: Jacobs, Rudolf Recipient: Haeckel, Ernst Dating: 29.07.1893
BRIEF [O.A.] Tischendörfer, F... Author: Tischendörfer, F... Recipient: Haeckel, Ernst Dating: 22.02.1914
BRIEF [O.A.] Tischendörfer, F... Author: Tischendörfer, F... Recipient: Haeckel, Ernst Dating: 16.11.1918
BRIEF [O.A.] Tischendörfer, F... Author: Tischendörfer, F... Recipient: Haeckel, Ernst Dating: 11.11.1918
