BRIEF [O.A.] Daxenbichler, Fanny Author: Daxenbichler, Fanny Recipient: Haeckel, Ernst Dating: 13.02.1917
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 16.02.1917
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 15.02.1917
BRIEF [O.A.] Fiorentini, Marianne Author: Fiorentini, Marianne Recipient: Haeckel, Ernst Dating: 28.02.1917
TELEGRAMM Wettstein, Richard von Author: Wettstein, Richard von Recipient: Haeckel, Ernst Corporation: K. K. Zoologisch-Botanische Gesellschaft in Wien Dating: 07.03.1917
BRIEF MIT UMSCHLAG Gabriel, Gábor Raimund Author: Gabriel, Gábor Raimund Recipient: Haeckel, Ernst Dating: 08.03.1917
BRIEF OHNE UMSCHLAG Bothe, Margarete Author: Bothe, Margarete Recipient: Haeckel, Ernst Dating: 18.07.1917