BRIEF MIT UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Carneri, Bartholomäus von Dating: 18.09.1896
WIDMUNG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Barrois, Jules Dating: 1896.??.?? [oder später]
ANSICHTSKARTE Haeckel, Ernst Author: Haeckel, Ernst Recipient: Wildenbruch, Ernst von Dating: 31.12.1896
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Karl Dating: 09.01.1896
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Karl Dating: 05.03.1896
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Karl Dating: 08.02.1896