Museums and Public Art Galleries:
 Hermitage Museum, Saint Petersburg, Russia
Portrait of Grand Prince Paul Petrovich in the Classroom, 1766
Portrait of Catherine II in Profile
Portrait of Duke Frederick
Erichsen, Virgilius
Louvre Museum Graphic Art Database, Paris (in French) NEW! 
Rijksmuseum, Amsterdam NEW!
Great scans of Rijksmuseum paintings, from the 'Memory of the Netherlands' project
Rijksmuseum Research Database, Amsterdam (in Dutch)
Pictures from Image Archives:
Vigilius Erichsen at CGFA 
Ciudad de la Pintura (in Spanish)
State Hermitage Museum Unofficial Site NEW!
Articles and Reference Sites:
Union List of Artist Names (Getty Museum) 
Reference sheet with basic information about the artist and pointers to other references.
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