Paintings in Museums and Public Art Galleries:
 Hermitage Museum, Saint Petersburg, Russia
5 works by Gallait
Louis Gallait in the Louvre Museum Database, Paris (only available in French)
Neue Pinakothek, Munich, Germany
Royal Museums of Fine Arts of Belgium Catalogue (in French) 
Many works online
Flemish Art Collection Database (in Dutch)
Joconde Database of French Museum Collections (in French)
The Wallace Collection, London, UK
The Duke of Alva in the Netherlands / Le serment de Vargas, 1835
Professional Tools:
Artprice
Pictures from Image Archives:
Wikimedia Commons Image Database 
Bildindex der Kunst und Architektur (in German)
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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