Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia Maximilian, Duke of Leuchtenberg, 1821 The Duke of Saxe-Altenburg Joseph's Family, 1848
Neue Pinakothek, Munich, Germany
Crocker Art Museum, California Portrait of Balthazar von Speth, 1820
Harvard University Art Museums, Massachusetts NEW!
Lenbach House, Munich, Germany (in German) 
Von der Heydt-Museum, Wuppertal, Germany (in German) 
Professional Tools:
Artprice
Pictures from Image Archives:
Joseph Stieler in the Web Gallery of Art 
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German) 
Brian Yoder's Art Gallery and Critic's Corner
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
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