BRIEF [O.A.] Lenbach, Franz von Author: Lenbach, Franz von Recipient: Haeckel, Ernst Dating: 08.03.1899
BRIEF [O.A.] Lenbach, Franz von Author: Lenbach, Franz von Recipient: Haeckel, Ernst Dating: 20.07.1899
BRIEF [O.A.] Lenbach, Franz von Author: Lenbach, Franz von Recipient: Haeckel, Ernst Dating: 26.09.1899
BRIEF [O.A.] Lenbach, Franz von Author: Lenbach, Franz von Recipient: Haeckel, Ernst Dating: 15.10.1899
BRIEF [O.A.] Lenbach, Franz von Author: Lenbach, Franz von Recipient: Haeckel, Ernst Dating: 05.11.1899
POSTKARTE Haeckel, Walther Author: Haeckel, Walther Recipient: Haeckel, Ernst; Haeckel, Agnes Dating: 30.01.1899