Museums and Public Art Galleries:
Fine Arts Museums of San Francisco Two Mounted Officers
Constantin Guys at the Louvre Museum, Paris Equipage in a Park, watercolor
Musée d'Orsay Collection Database, Paris NEW! Dans la rue, 1855
Courtauld Institute of Art, London, UK 9 works by or related to the artist
Harvard University Art Museums, Massachusetts NEW!
Joconde Database of French Museum Collections (in French) 
Kunstmuseum Basel, Switzerland NEW! Alphabetically under "G"
Kunstmuseum Winterthur, Switzerland (in German)  Cavaliers
Constantin Guys in the Los Angeles County Museum of Art Database
New Art Gallery, Walsall, England Choose the artist in the drop-down list and click "search"
The Essence of Line: French Drawings from Ingres to Degas
Commercial Galleries:
Peter Nahum At The Leicester Galleries, London, UK Archive of past displayed works which are "sold" or "not for sale"
Pictures from Image Archives:
Constantin Guys in the Art Renewal Center
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German) 
Other Web Sites:
The Modernist Journals Project NEW!
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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