BRIEF [O.A.] Graff, Ludwig von Author: Graff, Ludwig von Recipient: Haeckel, Ernst Corporation: Zool.-Zoot. Institut der K. K. Carl-Franzens-Universität Dating: 05.11.1896
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: W. Haferlandt & Pippow, Anstalt für naturhistorische Lehrmaterialien Dating: 13.06.1896
BRIEF [O.A.] Lapouge, Georges Vacher de Author: Lapouge, Georges Vacher de Recipient: Haeckel, Ernst Dating: 01.06.1896
BRIEF [O.A.] Lapouge, Georges Vacher de Author: Lapouge, Georges Vacher de Recipient: Haeckel, Ernst Corporation: Bibliothèque Universitaire de Rennes Dating: 12.11.1896
BRIEF [O.A.] Lapouge, Georges Vacher de Author: Lapouge, Georges Vacher de Recipient: Haeckel, Ernst Corporation: Bibliothèque Universitaire de Rennes Dating: 07.10.1896
BRIEF [O.A.] Lombardo, Franz Jama Author: Lombardo, Franz Jama Recipient: Haeckel, Ernst Dating: 01.06.1896