BRIEF OHNE UMSCHLAG Bender, Hedwig Author: Bender, Hedwig Recipient: Haeckel, Ernst Dating: 01.01.1898
BRIEF OHNE UMSCHLAG Bender, Hedwig Author: Bender, Hedwig Recipient: Haeckel, Ernst Dating: 30.04.1898
BRIEF OHNE UMSCHLAG Bender, Hedwig Author: Bender, Hedwig Recipient: Haeckel, Ernst Dating: 20.09.1905
BRIEF OHNE UMSCHLAG Bender, Hedwig Author: Bender, Hedwig Recipient: Haeckel, Ernst Dating: 26.03.1908
BRIEF [O.A.] Nicolai, L... Author: Nicolai, L... Recipient: Haeckel, Ernst Corporation: Marine und Kolonial Ausstellung Dating: 26.02.1901
POSTKARTE Fürbringer, Hermann Author: Fürbringer, Hermann Recipient: Haeckel, Ernst Dating: 07.07.1908
BRIEF [O.A.] Fürbringer, Hermann Author: Fürbringer, Hermann Recipient: Haeckel, Ernst Dating: 29.12.1908