BRIEF [O.A.] Korab, Waldemar C. de Author: Korab, Waldemar C. de Recipient: Haeckel, Ernst Dating: 20.12.1901
BRIEF [O.A.] Korab, Waldemar C. de Author: Korab, Waldemar C. de Recipient: Haeckel, Ernst Corporation: Instituto Moderno Dating: 26.09.1900