BRIEF OHNE UMSCHLAG Haeckel, Charlotte Author: Haeckel, Charlotte Recipient: Haeckel, Ernst Dating: 27.08.1861
Haeckel, Karl Author: Haeckel, Karl Recipient: Haeckel, Carl Gottlob; Haeckel, Charlotte Dating: 15.07.1861
BRIEF OHNE UMSCHLAG Hein, Reinhold Author: Hein, Reinhold Recipient: Haeckel, Ernst Dating: ??.06.1861
BRIEF OHNE UMSCHLAG Hein, Reinhold Author: Hein, Reinhold Recipient: Haeckel, Ernst Dating: 03.12.1861