TELEGRAMM Palézieux-Falconnet, Aimé de Author: Palézieux-Falconnet, Aimé de Recipient: Haeckel, Ernst Corporation: Weimarer Großherzoglicher Hof
BRIEF OHNE UMSCHLAG Nebuschka, Marie Luise Author: Nebuschka, Marie Luise Recipient: Haeckel, Ernst Dating: 24.08.1917
BRIEF [O.A.] Schön, Amelie von Author: Schön, Amelie von Recipient: Haeckel, Ernst Dating: 30.07.1908
BRIEF [O.A.] Schön, Amelie von Author: Schön, Amelie von Recipient: Haeckel, Ernst Dating: 01.01.1910
BRIEF [O.A.] Schön, Amelie von Author: Schön, Amelie von Recipient: Haeckel, Ernst Dating: 23.06.1911