Anonymous. [1893]. The Anthropology Building at the World's Columbian Exposition in Chicago, 1893: Apparatus Room 2. Photograph. (Peabody Museum - Photo 2004.24.726 - ©2007 Harvard University)
Anonymous. [1893]. The Section of Psychology at the World's Columbian Exposition in Chicago, 1893: Laboratory. Photograph. (Peabody Museum - Photo 2004.24.727 - ©2007 Harvard University)
Anonymous. [1893]. The Section of Psychology at the World's Columbian Exposition in Chicago, 1893: Room with Apparatus 1. Photograph. (Peabody Museum - Photo 2004.24.728 - ©2007 Harvard University)
Anonymous. [1893]. The Section of Psychology at the World's Columbian Exposition in Chicago, 1893: Room with Apparatus 2. Photograph. (Peabody Museum - Photo 2004.24.729 - ©2007 Harvard University)
Anonymous. 1894. [Portrait of Richard von Hertwig]. Photograph. (Museum für Naturkunde, Berlin: Collection of Portraits - HBSB ZI B I/5 - all rights reserved)
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Max Planck Institute for the History of Science, Berlin Institut für Information und Medien, Sprache und Kultur (I:IMSK), Universität Regensburg Fakultät Medien, Bauhaus-Universität Weimar