BRIEF [O.A.] Bastian, H. Charlton Author: Bastian, H. Charlton Recipient: Haeckel, Ernst Dating: 22.07.1902
BRIEF [O.A.] Bastian, H. Charlton Author: Bastian, H. Charlton Recipient: Haeckel, Ernst Dating: 01.11.1902
BRIEF OHNE UMSCHLAG Schmitz, Dora L. Author: Schmitz, Dora L. Recipient: Haeckel, Ernst Dating: 14.02.1909
BRIEF OHNE UMSCHLAG O'Neill, Aeneas Author: O'Neill, Aeneas Recipient: Haeckel, Ernst Dating: 09.03.1909
BRIEF OHNE UMSCHLAG Günther, Albert Author: Günther, Albert Recipient: Haeckel, Ernst Corporation: British Museum (National History) Dating: 08.08.1893
BRIEF OHNE UMSCHLAG Wallis, H. Author: Wallis, H. Recipient: Haeckel, Ernst Corporation: Clark & Co Dating: 21.08.1882