BRIEF [O.A.] Janes, Lewis G... Author: Janes, Lewis G... Recipient: Haeckel, Ernst Corporation: The Brooklyn Ethical Association Dating: 08.04.1893
BRIEF [O.A.] Aschieri, Ettor Luigi Author: Aschieri, Ettor Luigi Recipient: Haeckel, Ernst Dating: 13.04.1893
BRIEF [O.A.] Arms, J... M... Author: Arms, J... M... Recipient: Haeckel, Ernst Corporation: Boston Society of Natural History Dating: 14.10.1893
BRIEF [O.A.] Aschenberg, Alex... Author: Aschenberg, Alex... Recipient: Haeckel, Ernst Dating: 10.01.1893