BRIEF OHNE UMSCHLAG Bleek, Auguste Author: Bleek, Auguste Recipient: Haeckel, Charlotte Dating: 01.10.1870
BRIEF OHNE UMSCHLAG Bleek, Theodor Author: Bleek, Theodor Recipient: Haeckel, Charlotte Dating: 16.10.1866
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Charlotte Dating: 12.10.1842
BRIEF OHNE UMSCHLAG Sethe, Bertha Author: Sethe, Bertha Recipient: Haeckel, Charlotte Dating: 08.09.1888