Paintings in Museums and Public Art Galleries:
 Art Institute of Chicago NEW!
The Marriage of Maximilian of Austria with Mary of Burgundy
Fine Arts Museums of San Francisco
Many works by Theodoor van Thulden
Hermitage Museum, Saint Petersburg, Russia
Time Reveals the Truth, 1657
J. Paul Getty Museum, Los Angeles
Athena and Pegasus, 1644
Kunsthistorisches Museum Databank, Vienna (in German) 
Theodoor van Thulden at the Louvre Museum, Paris
Saint Francis of Paola Prophesying the Birth of a Son to Louise of Savoy, ca.1640
Louvre Museum Database, Paris
4 paintings
Louvre Museum Graphic Art Database, Paris (in French) NEW!
Theodoor van Thulden at the National Gallery of Art, Washington D.C.
Antwerp Blessed with Abundance, ca.1648
Rijksmuseum, Amsterdam NEW!
Great scans of Rijksmuseum paintings, from the 'Memory of the Netherlands' project
Rijksmuseum Research Database, Amsterdam (in Dutch)
Art Gallery of Greater Victoria, British Columbia
Bowes Museum, County Durham, UK
Sketch: Apotheosis of the Elector of Brandenburg
Cleveland Museum of Art, Ohio
Courtauld Institute of Art, London, UK
4 works by or related to the artist
Harvard University Art Museums, Massachusetts NEW!
Hunterian Museum and Art Gallery, University of Glasgow, Scotland
Royal Museums of Fine Arts of Belgium Catalogue (in French)
La musique, allégorie de l'harmonie conjugale
National Art Databases and Museum Inventories:
Flemish Art Collection Database, Belgium (in Dutch)
Joconde Database of French Museum Collections (in French)
UK National Inventory of Continental European Paintings (NICE) NEW!
Pictures from Image Archives:
Theodoor van Thulden in the Art Renewal Center
Theodoor van Thulden in the Web Gallery of Art 
Wikimedia Commons Image Database 
World Visit Guide (formerly Insecula)
Bildindex der Kunst und Architektur (in German)
(a welcome screen is displayed for a couple of seconds before the search results appear)
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!
Miscellaneous Sites:
Artarchiv Sample Artist Symbols + Monograms
Scroll down to monogram 1032
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.
Oxford Dictionary of Art (eNotes) NEW!
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