BILDPOSTKARTE Sokolowsky, Alexander Author: Sokolowsky, Alexander Recipient: Haeckel, Ernst Dating: 23.05.1907
BILDPOSTKARTE Sokolowsky, Alexander Author: Sokolowsky, Alexander Recipient: Haeckel, Ernst Dating: 01.01.1907
BILDPOSTKARTE Sokolowsky, Alexander Author: Sokolowsky, Alexander Recipient: Haeckel, Ernst Dating: 12.06.1908
BILDPOSTKARTE Sokolowsky, Alexander Author: Sokolowsky, Alexander Recipient: Haeckel, Ernst Dating: 13.09.1906
BILDPOSTKARTE Umlauff, Heinrich Author: Umlauff, Heinrich Recipient: Haeckel, Ernst Corporation: J. F. G. Umlauff Naturalien-Handlung und Museum Dating: 01.01.1910
BILDPOSTKARTE Bleek, Philipp August Author: Bleek, Philipp August Recipient: Haeckel, Ernst Dating: 17.09.1908
BILDPOSTKARTE Kükenthal, Willy Georg [et al.] Author: Kükenthal, Willy Georg [et al.] Recipient: Haeckel, Ernst Dating: 08.08.1901