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Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia Breakfast with Oysters
The Royal Collection, London, UK (Zoomable - look for the magnifying glass and the text "Magnify image") A still-life with fruit and birds
Ashmolean Museum at the University of Oxford, UK
Bowes Museum, County Durham, UK Grapes with a half Walnut
Flemish Art Collection Database (in Dutch) 
Joslyn Art Museum, Nebraska You must type "jacob" into the top left search box and click the "GO" button
Musée des Augustins, Toulouse, France Nature Morte
Royal Museums of Fine Arts of Belgium Catalogue (in French)  Nature morte
Pictures from Image Archives:
Jacob van Es in the Art Renewal Center
Jacob van Es in the Web Gallery of Art 
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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