BRIEF OHNE UMSCHLAG Smykalla, Paul Author: Smykalla, Paul Recipient: Haeckel, Ernst Dating: 05.04.1914
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 Martin, Margarate Author: Martin, Margarate Recipient: Haeckel, Ernst Dating: 03.09.1914
BRIEF OHNE UMSCHLAG Kükenthal, Willy Author: Kükenthal, Willy Recipient: Haeckel, Ernst Dating: 01.09.1914