BRIEF OHNE UMSCHLAG Strasburger, Julius Author: Strasburger, Julius Recipient: Haeckel, Ernst Dating: 10.06.1912
BRIEF OHNE UMSCHLAG Spiegelberg, Otto; Löwig, Karl Jakob Author: Spiegelberg, Otto; Löwig, Karl Jakob Recipient: Haeckel, Ernst Dating: 20.03.1874
BRIEF OHNE UMSCHLAG Berliner, Theodor Author: Berliner, Theodor Recipient: Haeckel, Ernst Dating: 23.07.1876
BRIEF OHNE UMSCHLAG Eckstein, Ernst; Pachur, Wilhelm; Ossig, Johannes; Friedländer, Georg; Landau, Fritz; Kallmann, Franz; Kramer, Edwin; Schindler, Walter Author: Eckstein, Ernst; Pachur, Wilhelm; Ossig, Johannes; Friedländer, Georg; Landau, Fritz; Kallmann, Franz; Kramer, Edwin; Schindler, Walter Recipient: Haeckel, Ernst Dating: 16.02.1914
BRIEF OHNE UMSCHLAG Kükenthal, Willy Author: Kükenthal, Willy Recipient: Haeckel, Ernst Dating: 02.11.1898
BRIEF OHNE UMSCHLAG Kükenthal, Willy Author: Kükenthal, Willy Recipient: Haeckel, Ernst Dating: 15.02.1899
BRIEF OHNE UMSCHLAG Kükenthal, Willy Author: Kükenthal, Willy Recipient: Haeckel, Ernst Dating: 15.02.1900