BRIEF [O.A.] Cabasino-Renda, G... Author: Cabasino-Renda, G... Recipient: Haeckel, Ernst Corporation: Giornale d'Italia – Rom Dating: 21.02.1911
BRIEF [O.A.] Skerst, Oscar von Author: Skerst, Oscar von Recipient: Haeckel, Ernst Dating: 05.06.1911