Wilhelm Conrad Röntgen (links) mit Studienkollegen in Utrecht. Von links nach rechts: Carl Ludwig Wilhelm Thormann (*05.12.1843 Rotterdam; +03.05.1908 Dieren), August Frederik Gerhard Avis (*29.12.1846 Westzaan) (hinten), Johan Marinus Schorer (*13.09.1843 Koudekerke/Zeeland; +11.04.1923 ´s-Gravenhage) und Johannes de Bie Luden (*1847 Amsterdam). Sitzendes/stehendes Gruppenportrait (Ganzfigur) in Frontalansicht und im Viertelprofil (Person ganz rechts).
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