Paintings in Museums and Public Art Galleries:
 Hermitage Museum, Saint Petersburg, Russia
Changeable Weather
Musée d'Orsay Collection Database, Paris
Jeune mère et ses enfants dans un salon
Clark Art Institute, Williamstown, Massachusetts - Provenance Research Project
Mother and Child
National Art Databases and Museum Inventories:
Flemish Art Collection Database, Belgium (in Dutch) 
2 works online
UK National Inventory of Continental European Paintings (NICE) NEW!
Pictures from Image Archives:
Gustave Leonard de Jonghe in the Art Renewal Center
State Hermitage Museum Unofficial Site NEW!
Articles and Reference Sites:
Union List of Artist Names (Getty Museum) 
Reference sheet with basic information about the artist and pointers to other references.
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