BRIEF [O.A.] Roth von Otto, Elsa Author: Roth von Otto, Elsa Recipient: Haeckel, Ernst Dating: 04.06.1908
BRIEF [O.A.] Roth von Otto, Elsa Author: Roth von Otto, Elsa Recipient: Haeckel, Ernst Dating: 09.04.1908
POSTKARTE Roth von Otto, Elsa Author: Roth von Otto, Elsa Recipient: Haeckel, Ernst Dating: 18.04.1908
POSTKARTE Roth von Otto, Elsa Author: Roth von Otto, Elsa Recipient: Haeckel, Ernst Dating: 04.03.1908
ANSICHTSKARTE Roth von Otto, Elsa Author: Roth von Otto, Elsa Recipient: Haeckel, Ernst Dating: 30.12.1908