BRIEF [O.A.] Vorpahl, Katharina Author: Vorpahl, Katharina Recipient: Haeckel, Ernst Dating: 15.02.1904
BRIEF [O.A.] Vogtherr, Ewald Author: Vogtherr, Ewald Recipient: Haeckel, Ernst Corporation: Bund freier religiöser Gemeinden Deutschlands Dating: 18.12.1904