BRIEF [O.A.] Staffel, E... Author: Staffel, E... Recipient: Haeckel, Ernst Corporation: Chirurgische Privatklinik Dating: 29.03.1909
BRIEF [O.A.] Weller, Ernst Otto Author: Weller, Ernst Otto Recipient: Erbengemeinschaft Haeckel Corporation: Thüringer Verlagsanstalt Dating: 22.08.1919
BRIEF OHNE UMSCHLAG Raabe, Paul Author: Raabe, Paul Recipient: Haeckel, Ernst Corporation: Verlag der "Allgemeinen Zeitung Chemnitz" Dating: 02.06.1911
KARTE Haan, Margarethe; Haan, Conrad Emil Author: Haan, Margarethe; Haan, Conrad Emil Recipient: Haeckel, Ernst Dating: 15.02.1909
BRIEF OHNE UMSCHLAG Henne, G. F. Author: Henne, G. F. Recipient: Haeckel, Ernst Corporation: in Firma Theodor Gehlert Dating: 19.02.1878
BRIEF OHNE UMSCHLAG Henne, G. F. Author: Henne, G. F. Recipient: Haeckel, Ernst Corporation: in Firma Theodor Gehlert Dating: 25.07.1877
