Sylvester Harding Works Online
Categorized & Annotated
Paintings in Museums and Public Art Galleries Worldwide:
National Portrait Gallery, London, UKPictures from Image Archives:
The Huntington Library, California
The Wallace Collection, London, UK
New York Public Library Digital GalleryArticles and Reference Sites:
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Union List of Artist Names (Getty Museum)
Reference sheet with basic information about the artist and pointers to other references.