BRIEF [O.A.] Schön, Amelie von Author: Schön, Amelie von Recipient: Haeckel, Ernst Dating: 30.07.1908
BRIEF [O.A.] Schön, Amelie von Author: Schön, Amelie von Recipient: Haeckel, Ernst Dating: 01.01.1910
BRIEF [O.A.] Schön, Amelie von Author: Schön, Amelie von Recipient: Haeckel, Ernst Dating: 23.06.1911
BRIEF [O.A.] Schön, Amelie von Author: Schön, Amelie von Recipient: Haeckel, Ernst Dating: 10.09.1915
BRIEF [O.A.] Schön, Amelie von Author: Schön, Amelie von Recipient: Haeckel, Ernst Dating: 16.11.1918