BRIEF OHNE UMSCHLAG Fürbringer, Max Author: Fürbringer, Max Recipient: Haeckel, Ernst Dating: 04.06.1882
BRIEF OHNE UMSCHLAG Fürbringer, Max Author: Fürbringer, Max Recipient: Haeckel, Ernst Dating: 05.01.1888
BRIEF OHNE UMSCHLAG Fürbringer, Max Author: Fürbringer, Max Recipient: Haeckel, Ernst Dating: 09.03.1888
BRIEF OHNE UMSCHLAG Fürbringer, Max Author: Fürbringer, Max Recipient: Haeckel, Ernst Dating: 19.06.1888
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 28.08.1911
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 04.09.1911
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 20.10.1911
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 25.10.1911
BRIEF [O.A.] Flothuis, M... H... Author: Flothuis, M... H... Recipient: Haeckel, Ernst Dating: 30.10.1911