19. The undated pencil drawing, formerly in the possession of Wilhelm Kempff, is now in the Bildarchiv of the Austrian National Library, Vienna. For an analysis of the leaf and some speculation as to its date, see Rita Steblin, “Schwinds Porträtskizze ‘Schubert am Klavier,’” Schubert durch die Brille, Mitteilungen 10 (January 1993): 45–52.