BRIEF [O.A.] Haeckel, Ernst Author: Haeckel, Ernst Recipient: Uslar-Gleichen, Bernhard von Dating: 05.09.1910
BRIEF [O.A.] Bonardi, Edoardo Author: Bonardi, Edoardo Recipient: Haeckel, Ernst Corporation: Medico Primario Ospedale Maggiore Dating: 29.12.1910
BRIEF [O.A.] Cifarelli, Natale Author: Cifarelli, Natale Recipient: Haeckel, Ernst Dating: 22.04.1910
POSTKARTE Cattaneo, Giacomo Author: Cattaneo, Giacomo Recipient: Haeckel, Ernst Corporation: R. Università di Genova, Anatomia Dating: 14.02.1910