Paintings in Museums and Public Art Galleries:
Réunion des Musées Nationaux, France (in French)  (Click the magnifying-glass icon to zoom, then drag the corner of the window to make it larger) Passage du mont Saint-Bernard, 1830
The Royal Collection, London, UK (Zoomable - look for the magnifying glass and the text "Magnify image")
Art Gallery of South Australia, Adelaide NEW! 4 paintings online
National Gallery of Victoria, Australia
National Library of Australia, Canberra
Professional Tools:
Artprice
Pictures from Image Archives:
Artyzm
Bildindex der Kunst und Architektur (in German) 
Other Web Sites:
In the Artist's Footsteps
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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