Paintings in Museums and Public Art Galleries:
Louvre Museum Graphic Art Database, Paris (in French) NEW! 
Museum of Fine Arts, Houston, Texas  (Zoomify viewer requires Java in order to view images)
Marcus Gheeraerts at the National Gallery of Art, Washington D.C. Biography available, but no works by this artist are online
Norton Simon Museum, Pasadena, California
The Royal Collection, London, UK (Zoomable - look for the magnifying glass and the text "Magnify image")
Art Gallery of South Australia, Adelaide Magdalen Poultney, later Lady Aston, ca.1620
Bowes Museum, County Durham, UK Portrait of a Lady
Compton Verney, Warwick, England Portrait of a Boy aged two, 1608
Jersey Heritage Trust, UK
National Maritime Museum, Greenwich, UK
National Portrait Gallery, London, UK
Norwich Museums, England
State Museums of Florence Digital Archive, Italy
State Museums of Florence Digital Archive, Italy
Tate Gallery, London, UK
Tyne & Wear Museums Database, England
Victoria and Albert Museum Catalogue, London, UK Margaret Layton (formerly Laton), ca.1620
National Art Databases and Museum Inventories:
Art Fund for UK Museums 3 works
Flemish Art Collection Database, Belgium (in Dutch) 
UK National Inventory of Continental European Paintings (NICE) NEW!
Pictures from Image Archives:
Marcus Gheeraerts in the Art Renewal Center
Marcus Gheeraerts at CGFA 
Marcus Gheeraerts in the Web Gallery of Art 
Wikimedia Commons Image Database 
Artyzm
Miscellaneous Sites:
UK Government Art Collection
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.
Wikipedia, the "Open Content" Encyclopedia
Oxford Dictionary of Art (eNotes) NEW! 
Tate Magazine Portrait of an Unknown Lady, ca.1595
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