BRIEF [O.A.] Dory-Ehrenfreund Author: Dory-Ehrenfreund Recipient: Haeckel, Ernst Corporation: Wiener Giro- und Cassen-Verein Dating: 22.02.1908
BRIEF [O.A.] Daxenbichler, Fanny Author: Daxenbichler, Fanny Recipient: Haeckel, Ernst Dating: 28.02.1908
POSTKARTE Daxenbichler, Fanny Author: Daxenbichler, Fanny Recipient: Haeckel, Ernst Dating: 28.07.1908
TELEGRAMM Drugievic, Ferdinand Author: Drugievic, Ferdinand Recipient: Haeckel, Ernst Dating: 15.02.1908
BRIEF [O.A.] Diehl, Gustav Eugen Author: Diehl, Gustav Eugen Recipient: Haeckel, Ernst Corporation: Erdgeist, Illustrierte Halbmonatsschrift Dating: 05.08.1908
BRIEF OHNE UMSCHLAG Benedikt, Clotilde Author: Benedikt, Clotilde Recipient: Haeckel, Ernst Dating: 09.03.1908