BRIEF OHNE UMSCHLAG Dohrn, Anton; Dohrn, Heinrich Author: Dohrn, Anton; Dohrn, Heinrich Recipient: Haeckel, Ernst Dating: 23.12.1863
BRIEF OHNE UMSCHLAG Haeckel, Heinrich Author: Haeckel, Heinrich Recipient: Schmidt, Heinrich Dating: 28.10.1920
BRIEF OHNE UMSCHLAG Lewinsky, Bernhard Author: Lewinsky, Bernhard Recipient: Haeckel, Ernst Dating: 13.02.1909
BRIEF [O.A.] Vorpahl, Katharina Author: Vorpahl, Katharina Recipient: Haeckel, Ernst Dating: 15.02.1904
BRIEF [O.A.] Vogtherr, E... Author: Vogtherr, E... Recipient: Haeckel, Ernst Corporation: Bund freier religiöser Gemeinden Deutschlands Dating: 19.05.1906