POSTKARTE Osborn, Henry Fairfield Author: Osborn, Henry Fairfield Recipient: Haeckel, Ernst Dating: ??.??.1906
ANSICHTSKARTE Grazie, Marie Eugenie delle; Müllner, Laurenz Author: Grazie, Marie Eugenie delle; Müllner, Laurenz Recipient: Haeckel, Ernst Dating: 23.08.1906
BRIEF MIT UMSCHLAG Grazie, Marie Eugenie delle Author: Grazie, Marie Eugenie delle Recipient: Haeckel, Ernst Dating: 02.02.1906
BRIEF OHNE UMSCHLAG Grazie, Marie Eugenie delle Author: Grazie, Marie Eugenie delle Recipient: Haeckel, Ernst Dating: 27.06.1906
BRIEF [O.A.] Gerlach, K... A... Author: Gerlach, K... A... Recipient: Haeckel, Ernst Dating: 28.08.1906
BRIEF [O.A.] Goldschmidt, Max Author: Goldschmidt, Max Recipient: Haeckel, Ernst Corporation: Dr. Max Goldschmidt, Bureau für Zeitungsausschnitte Dating: 31.01.1906
