Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia Allegory of the Twelve Years' Truce, ca.1609
Kunsthistorisches Museum Databank, Vienna (in German) 
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) 
Chrysler Museum, Norfolk, Virginia
Courtauld Institute of Art, London, UK Man of Sorrows - Ecce Homo
Fred Jones Jr. Museum of Art at the University of Oklahoma Perseus and Andromeda
Indiana University Art Museum, Bloomington - Provenance Research Project The Finding of Moses
Royal Museums of Fine Arts of Belgium Catalogue (in French)  Several works online
National Art Databases and Museum Inventories:
Flemish Art Collection Database, Belgium (in Dutch) 
Pictures from Image Archives:
Hendrik de Clerck in the Art Renewal Center
Hendrik de Clerck 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)
State Hermitage Museum Unofficial Site NEW!
Miscellaneous Sites:
Artarchiv Sample Artist Symbols + Monograms Scroll down to monogram 209
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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