BRIEF [O.A.] Bartholdi, Albert F... Author: Bartholdi, Albert F... Recipient: Haeckel, Ernst Dating: 16.02.1914
BRIEF OHNE UMSCHLAG Forrer, Alphonse Author: Forrer, Alphonse Recipient: Haeckel, Ernst Dating: 27.10.1879
BRIEF OHNE UMSCHLAG Forrer, Alphonse Author: Forrer, Alphonse Recipient: Haeckel, Ernst Dating: 16.10.1879