BRIEF [O.A.] Vranelli, G... Author: Vranelli, G... Recipient: Haeckel, Ernst Corporation: Ministero dell'Istruzione Dating: 20.03.1892
BRIEF [O.A.] Peretti, Vincenzo Author: Peretti, Vincenzo Recipient: Haeckel, Ernst Dating: 27.05.1902
BRIEF [O.A.] Prato, Christofero Author: Prato, Christofero Recipient: Haeckel, Ernst Dating: 09.02.1906
BRIEF [O.A.] Paix Séailles, Ch... Author: Paix Séailles, Ch... Recipient: Haeckel, Ernst Corporation: Le Courrier Européen Dating: 24.12.1904
BRIEF [O.A.] Reggroin, Antonio Author: Reggroin, Antonio Recipient: Haeckel, Ernst Corporation: Zeitschrift "Il Rogo" Dating: 07.11.1911
BRIEF [O.A.] Ovazza, V... E... Author: Ovazza, V... E... Recipient: Haeckel, Ernst Dating: 11.03.1910
BRIEF [O.A.] Nicotra, Leopoldo Author: Nicotra, Leopoldo Recipient: Haeckel, Ernst Dating: 12.03.1913
BRIEF [O.A.] Grassi, Giovanni Battista Author: Grassi, Giovanni Battista Recipient: Haeckel, Ernst Corporation: Senato del Regno Dating: 16.01.1911
