KARTE Haeckel, Ernst Franz Max Author: Haeckel, Ernst Franz Max Recipient: Haeckel, Ernst Dating: 14.02.1915
POSTKARTE Haeckel, Ernst Franz Max Author: Haeckel, Ernst Franz Max Recipient: Haeckel, Ernst Dating: 15.04.1915
POSTKARTE Haeckel, Ernst Franz Max Author: Haeckel, Ernst Franz Max Recipient: Haeckel, Ernst Dating: 17.04.1915
POSTKARTE Heilmann, Eva (geb. Hahn) Author: Heilmann, Eva (geb. Hahn) Recipient: Haeckel, Ernst Dating: 16.02.1915
BRIEF [O.A.] Heilmann, Eva (geb. Hahn) Author: Heilmann, Eva (geb. Hahn) Recipient: Haeckel, Ernst Dating: 30.12.1915