BRIEF [O.A.] Bäumler, Johann Andreas Author: Bäumler, Johann Andreas Recipient: Haeckel, Ernst Dating: 13.04.1878
BRIEF [O.A.] Bäumler, Johann Andreas Author: Bäumler, Johann Andreas Recipient: Haeckel, Ernst Dating: 24.10.1878
BRIEF [O.A.] Bäumler, Johann Andreas Author: Bäumler, Johann Andreas Recipient: Haeckel, Ernst Dating: 13.02.1909
BRIEF [O.A.] Bäumler, Johann Andreas Author: Bäumler, Johann Andreas Recipient: Haeckel, Ernst Dating: 12.01.1918
BRIEF [O.A.] Bäumler, Johann Andreas Author: Bäumler, Johann Andreas Recipient: Haeckel, Ernst Dating: 12.02.1918
BRIEF [O.A.] Baerenbach, Friedrich von Author: Baerenbach, Friedrich von Recipient: Haeckel, Ernst Dating: 30.12.1877