BRIEF [O.A.] Vranelli, G. Author: Vranelli, G. Recipient: Haeckel, Ernst Corporation: Ministero dell'Istruzione Dating: 20.03.1892
BRIEF [O.A.] Schneider, Friedrich Author: Schneider, Friedrich Recipient: Haeckel, Ernst Dating: 08.06.1916
BRIEF [O.A.] Schneider, Friedrich Author: Schneider, Friedrich Recipient: Haeckel, Ernst Dating: 19.08.1916
BRIEF [O.A.] Schneider, Friedrich Author: Schneider, Friedrich Recipient: Haeckel, Ernst Dating: ??.12.1916
BRIEF [O.A.] Sammito, Aldisio M. Author: Sammito, Aldisio M. Recipient: Haeckel, Ernst Dating: 05.01.1888
BRIEF [O.A.] Recipient: Haeckel, Ernst Corporation: Verwaltungsrath der Dampfschiffahrt-Gesellschaft des Österr.-Ungar. Lloyd Dating: 29.11.1889
BRIEF [O.A.] Schneider, Georg Heinrich Author: Schneider, Georg Heinrich Recipient: Haeckel, Ernst Dating: 10.12.1876
BRIEF [O.A.] Schneider, Georg Heinrich Author: Schneider, Georg Heinrich Recipient: Haeckel, Ernst Dating: 04.01.1877