Paintings in Museums and Public Art Galleries:
 Hermitage Museum, Saint Petersburg, Russia
Liechtenstein Museum, Vienna
Archduke Karl with his Staff at the Battle of Aspern, 1820
Louvre Museum Database, Paris
Akademie der Bildenden Künst, Vienna (in German) 
Minneapolis Institute of Arts, Minnesota 
National Art Databases and Museum Inventories:
Joconde Database of French Museum Collections (in French)
Pictures from Image Archives:
Johann Peter Krafft in the Art Renewal Center
Fine Arts in Hungary
Johann Peter Krafft in the Web Gallery of Art
Wikimedia Commons Image Database 
Farbdia Archiv (Color Slide Archive) (in German)
Thousands of photographs of fresco cycles and wall decorations in churches and other buildings in and around Germany.
Click "Galerie" for a normal overview; click "digilib" to zoom in.
State Hermitage Museum Unofficial Site NEW!
Articles and Reference Sites:
Grove Dictionary of Art Online (excerpt) 
Union List of Artist Names (Getty Museum)
Reference sheet with basic information about the artist and pointers to other references.
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