BRIEF [O.A.] Brusina, Spiridon Author: Brusina, Spiridon Recipient: Haeckel, Ernst Corporation: Zoologisches National-Museum Dating: 04.05.1880
BRIEF [O.A.] Cattaneo, Giacomo Author: Cattaneo, Giacomo Recipient: Haeckel, Ernst Dating: 27.01.1880
BRIEF [O.A.] Cornette, Arthur Author: Cornette, Arthur Recipient: Haeckel, Ernst Corporation: De Vrije Gedachte, La Libre Pensée Dating: 07.06.1880
BRIEF [O.A.] Bucchich, Gregorio Author: Bucchich, Gregorio Recipient: Haeckel, Ernst Dating: 14.05.1880
BRIEF [O.A.] Ercolani, G... B... Author: Ercolani, G... B... Recipient: Haeckel, Ernst Dating: 24.03.1880