Paintings in Museums and Public Art Galleries:
Hermitage Museum, Saint Petersburg, Russia Italian Harbour, 1697 Landscape with Dancing Shepherdesses, 1693
Kunsthistorisches Museum Databank, Vienna (in German) 
Museum of Fine Arts, Boston 
Chazen Museum of Art at the University of Wisconsin Landscape with a Waterfall (after Salvator Rosa)
Courtauld Institute of Art, London, UK
State Museums of Florence Digital Archive, Italy
Pictures from Image Archives:
Jacob de Heusch in the Art Renewal Center
Jacob de Heusch 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.
Wikipedia, the "Open Content" Encyclopedia
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