KARTE Haeckel, Walter Author: Haeckel, Walter Recipient: Haeckel, Ernst; Haeckel, Agnes Dating: 07.09.1889
KARTE Haeckel, Walther Author: Haeckel, Walther Recipient: Haeckel, Ernst; Haeckel, Agnes Dating: 16.11.1889
KARTE Haeckel, Walther; Haeckel, Josefa Author: Haeckel, Walther; Haeckel, Josefa Recipient: Haeckel, Ernst; Haeckel, Agnes [Eltern] Dating: 12.10.1910