BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 09.02.1919
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 02.03.1919
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 18.06.1919
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 06.07.1919