Museums and Public Art Galleries:
Art Institute of Chicago
Lambert-Sigisbert Adam at the Louvre Museum, Paris Neptune Calming the Waves, marble
Louvre Museum Database, Paris 2 sculptures
Courtauld Institute of Art, London, UK 12 works by or related to the artist
Lambert-Sigisbert Adam in the Los Angeles County Museum of Art Database
National Art Databases and Museum Inventories:
Joconde Database of French Museum Collections (in French) 
Pictures from Image Archives:
Lambert-Sigisbert Adam in the Art Renewal Center
Lambert-Sigisbert Adam in the Web Gallery of Art 
World Visit Guide (formerly Insecula)
Bildindex der Kunst und Architektur (in German)  (a welcome screen is displayed for a couple of seconds before the search results appear)
Articles and Reference Sites:
Grove Dictionary of Art Online (excerpt) 
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
Encyclopedia Britannica, 1911 Edition Complete article, now in the public domain. Obviously, some facts may have changed since 1911.
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