TELEGRAMM Wiedersheim, Robert Author: Wiedersheim, Robert Recipient: Haeckel, Ernst Dating: 16.02.1909
TELEGRAMM Wiedersheim, Robert Author: Wiedersheim, Robert Recipient: Haeckel, Ernst Dating: 16.02.1914
TELEGRAMM Galli, Gottfried; Galli, Melanie Author: Galli, Gottfried; Galli, Melanie Recipient: Haeckel, Ernst Dating: 16.02.1909