BRIEF [O.A.] Mentz, Frida, geb. Kessel Author: Mentz, Frida, geb. Kessel Recipient: Haeckel, Ernst Dating: ??.02.1903
BRIEF [O.A.] Mentz, Frida, geb. Kessel Author: Mentz, Frida, geb. Kessel Recipient: Haeckel, Ernst Dating: ??.02.1903
BRIEF [O.A.] Neustadtel, Arthur Author: Neustadtel, Arthur Recipient: Haeckel, Ernst Dating: 04.07.1903
BRIEF OHNE UMSCHLAG Jodl, Friedrich Author: Jodl, Friedrich Recipient: Haeckel, Ernst Dating: 02.05.1903