BRIEF [O.A.] Dumont, Emerich Baron Author: Dumont, Emerich Baron Recipient: Haeckel, Ernst Dating: 25.06.1876
BRIEF [O.A.] Matulic, Lucian Romeo Author: Matulic, Lucian Romeo Recipient: Haeckel, Ernst Dating: 12.04.1876
BRIEF [O.A.] Wellenau, F... C... Author: Wellenau, F... C... Recipient: Haeckel, Ernst Dating: 27.10.1876