POSTKARTE Nußbaumer, Joh... & Leop... Author: Nußbaumer, Joh... & Leop... Recipient: Haeckel, Ernst Dating: 30.12.1913
BRIEF [O.A.] Nußbaumer, Joh... & Leop... Author: Nußbaumer, Joh... & Leop... Recipient: Haeckel, Ernst Dating: 04.09.1891
BRIEF [O.A.] Nußbaumer, Joh... & Leop... Author: Nußbaumer, Joh... & Leop... Recipient: Haeckel, Ernst Dating: 09.09.1913
BRIEF [O.A.] Nußbaumer, Joh... & Leop... Author: Nußbaumer, Joh... & Leop... Recipient: Haeckel, Ernst Dating: 16.02.1914