BRIEF [O.A.] Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 13.10.1893
BRIEF [O.A.] Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 23.06.1914
BRIEF OHNE UMSCHLAG Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 25.03.1902
BRIEF [O.A.] Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 13.02.1904
ANSICHTSKARTE Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 1911.03.04 [?]
BILDPOSTKARTE Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 20.12.1905
BRIEF [O.A.] Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 03.06.1909
POSTKARTE Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 15.10.1910(?)
BRIEF [O.A.] Basso, Fritzi von Author: Basso, Fritzi von Recipient: Haeckel, Ernst Dating: 21.12.1910