PORTRÄTPOSTKARTE Haeckel, Walther Author: Haeckel, Walther Recipient: Haeckel, Ernst; Haeckel, Agnes Dating: 01.05.1900
BRIEF OHNE UMSCHLAG Sethe, Emma Henriette Bertha Sophie (1812-1904) Author: Sethe, Emma Henriette Bertha Sophie (1812-1904) Recipient: Haeckel, Ernst Dating: 11.07.1876