Paintings in Museums and Public Art Galleries:
Minneapolis Institute of Arts, Minnesota  View of the Colosseum from the Orti Farnesiani, 1833
Joconde Database of French Museum Collections (in French) 
Professional Tools:
Artprice
Pictures from Image Archives:
Felix Boisselier in the Art Renewal Center
Felix Boisselier at The Athenaeum 
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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