BRIEF OHNE UMSCHLAG Sethe, Heinrich Author: Sethe, Heinrich Recipient: Haeckel, Ernst Dating: 18.11.1841
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Carl & Charlotte [Eltern] Dating: 01.01.1841
BRIEF OHNE UMSCHLAG Haeckel, Ernst Author: Haeckel, Ernst Recipient: Haeckel, Karl Dating: 22.04.1841