POSTKARTE Hochstetter, Ferdinand Author: Hochstetter, Ferdinand Recipient: Haeckel, Ernst Dating: 14.03.1906
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 16.02.1917
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 15.02.1917
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 28.02.1917
POSTKARTE Rakus, Theodor G... Author: Rakus, Theodor G... Recipient: Haeckel, Ernst Dating: 15.03.1912
POSTKARTE Rakus, Theodor G... Author: Rakus, Theodor G... Recipient: Haeckel, Ernst Dating: 16.03.1912