BRIEF [O.A.] Anton, Günther Kurt Author: Anton, Günther Kurt Recipient: Haeckel, Ernst Dating: 14.02.1904
BRIEF [O.A.] Anton, Günther Kurt Author: Anton, Günther Kurt Recipient: Haeckel, Ernst Dating: 14.11.1904
TELEGRAMM Klinkhardt, Werner Author: Klinkhardt, Werner Recipient: Haeckel, Ernst Corporation: Ausschuß der Studentenschaft der Universität Jena Dating: 16.02.1904
TELEGRAMM Bardeleben, Karl von Author: Bardeleben, Karl von Recipient: Haeckel, Ernst Dating: 16.02.1904
BRIEF [O.A.] Bardeleben, Karl von Author: Bardeleben, Karl von Recipient: Haeckel, Ernst Dating: 16.02.1904
BRIEF OHNE UMSCHLAG Giltsch, Adolf Author: Giltsch, Adolf Recipient: Haeckel, Ernst Dating: 02.03.1904