BRIEF [O.A.] Renault, Hyacinthe Author: Renault, Hyacinthe Recipient: Haeckel, Ernst Dating: 14.12.1903
BRIEF [O.A.] Renard, A... F... Author: Renard, A... F... Recipient: Haeckel, Ernst Dating: 24.04.1901
BRIEF [O.A.] Renard, A... F... Author: Renard, A... F... Recipient: Haeckel, Ernst Dating: 15.07.1902