POSTKARTE Bölsche, Wilhelm; Bölsche, Johanna Author: Bölsche, Wilhelm; Bölsche, Johanna Recipient: Haeckel, Ernst Dating: 13.09.1915
POSTKARTE Bölsche, Wilhelm; Bölsche, Johanna; Weber, E.; Weber, Nathalie Author: Bölsche, Wilhelm; Bölsche, Johanna; Weber, E.; Weber, Nathalie Recipient: Haeckel, Ernst Dating: 29.08.1911
BRIEF [O.A.] Wießner, Alexander Author: Wießner, Alexander Recipient: Haeckel, Ernst Dating: 21.11.1874
BRIEF [O.A.] Wießner, Alexander Author: Wießner, Alexander Recipient: Haeckel, Ernst Dating: 28.11.1874
BRIEF [O.A.] Wießner, Alexander Author: Wießner, Alexander Recipient: Haeckel, Ernst Dating: 09.12.1874
BRIEF [O.A.] Wießner, Alexander Author: Wießner, Alexander Recipient: Haeckel, Ernst Dating: 13.12.1874
BRIEF [O.A.] Wießner, Alexander Author: Wießner, Alexander Recipient: Haeckel, Ernst Dating: 28.12.1874