BRIEF [O.A.] Gadeau de Kerville, Henri Author: Gadeau de Kerville, Henri Recipient: Haeckel, Ernst Dating: 21.06.1897
BRIEF [O.A.] Lortet, Louis Author: Lortet, Louis Recipient: Haeckel, Ernst Corporation: Faculté de Medecine et de Pharmacie Dating: 02.12.1897
BRIEF [O.A.] Marion, A... F... Author: Marion, A... F... Recipient: Haeckel, Ernst Dating: 27.06.1897
BRIEF [O.A.] Schleicher, Fréres Author: Schleicher, Fréres Recipient: Haeckel, Ernst Dating: 27.01.1897