POSTKARTE Thoden van Velzen, Syo Kornelius Author: Thoden van Velzen, Syo Kornelius Recipient: Haeckel, Ernst Dating: 01.01.1915
BRIEF [O.A.] Thoden van Velzen, Syo Kornelius Author: Thoden van Velzen, Syo Kornelius Recipient: Haeckel, Ernst Dating: 15.02.1915
BRIEF [O.A.] Thoden van Velzen, Syo Kornelius Author: Thoden van Velzen, Syo Kornelius Recipient: Haeckel, Ernst Dating: 15.02.1915
BRIEF [O.A.] Thoden van Velzen, Syo Kornelius Author: Thoden van Velzen, Syo Kornelius Recipient: Haeckel, Ernst Dating: 28.09.1915
BRIEF [O.A.] Thoden van Velzen, Syo Kornelius Author: Thoden van Velzen, Syo Kornelius Recipient: Haeckel, Ernst Dating: 22.10.1915
BRIEF [O.A.] Thoden van Velzen, Syo Kornelius Author: Thoden van Velzen, Syo Kornelius Recipient: Haeckel, Ernst Dating: 24.12.1915
BILDPOSTKARTE Haeckel, Emma Author: Haeckel, Emma Recipient: Haeckel, Ernst; Haeckel, Agnes Dating: 06.01.1915