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Briefe von Robert Volkmann Bildnis. Robert Volkmann Robert Volkmann Heliogravur von Meisenbach Riffarth Co Leipzig Briefe von Robert Volkmann Hans Volkmann Hrsg Breitkopf und Hrtel Leipzig Online archive org archive org Digitalisat der University of Toronto ca Meisenbach Riffarth Co Leipzig PDold Robert Volkmann Photogravure