Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia Buying Grapes, 1669
Kunsthistorisches Museum Databank, Vienna (in German) 
Jacob Ochtervelt at the Metropolitan Museum of Art, New York City  The Love Letter, ca.1670
National Gallery, London, UK NEW!
Norton Simon Museum, Pasadena, California
Rijksmuseum, Amsterdam NEW! Great scans of Rijksmuseum paintings, from the 'Memory of the Netherlands' project
Rijksmuseum Research Database, Amsterdam (in Dutch) 
Amsterdams Historisch Museum, Amsterdam (in Dutch) NEW! 
Art Fund for UK Museums
Birmingham Museums & Art Gallery, UK
Carnegie Museum of Art, Pittsburgh, Pennsylvania
Cleveland Museum of Art, Ohio A Musical Company
E.G. Bührle Collection, Zurich (Click on the title to see a specific work, then click on the image to enlarge) The Backgammon Players, ca.1670
Manchester City Art Gallery, UK
Museum der Bildenden Künste, Leipzig (in German) 
Thyssen-Bornemisza Museum, Madrid NEW! - to switch to English, scroll to the bottom of the page and click "English Version" - images are zoomable; click on the "expand" icon below the detail image - you can zoom in via the mouse scroll wheel, then click the image and drag it around
Professional Tools:
Artarchiv Sample Artist Symbols + Monograms Scroll down to monogram 744
Pictures from Image Archives:
Jacob Ochtervelt in the Art Renewal Center
Jacob Ochtervelt at CGFA 
Jacob Ochtervelt in the Web Gallery of Art 
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German)  (a welcome screen is displayed for a couple of seconds before the search results appear)
Ciudad de la Pintura (in Spanish) 
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
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