BRIEF OHNE UMSCHLAG Benedikt, Moritz Author: Benedikt, Moritz Recipient: Haeckel, Ernst Dating: 31.01.1918
POSTKARTE Becker, Franz Johann Jakob Emil Author: Becker, Franz Johann Jakob Emil Recipient: Haeckel, Ernst Dating: 11.04.1918
BRIEF OHNE UMSCHLAG Becker, Franz Johann Jakob Emil Author: Becker, Franz Johann Jakob Emil Recipient: Haeckel, Ernst Dating: 16.11.1918
BRIEF [O.A.] Berger, Elise Author: Berger, Elise Recipient: Haeckel, Ernst Corporation: Königl. Wilhelma Dating: 14.02.1918
POSTKARTE Baumann-Berner Author: Baumann-Berner Recipient: Haeckel, Ernst Corporation: Redaktion der Süddeutschen Monatshefte Dating: 05.04.1918
BRIEF OHNE UMSCHLAG Baumfelder, Hans Author: Baumfelder, Hans Recipient: Haeckel, Ernst Dating: 14.02.1918
BRIEF [O.A.] Bamberger, Johann Author: Bamberger, Johann Recipient: Haeckel, Ernst Dating: 16.02.1918
BRIEF OHNE UMSCHLAG Bamberger, Johann Author: Bamberger, Johann Recipient: Haeckel, Ernst Dating: 03.03.1918