Museums and Public Art Galleries:
Royal Academy of Arts Online Catalogue Landscape with Figures, 1839
Tate Gallery, London, UK
Commercial Galleries:
Peter Nahum At The Leicester Galleries, London, UK Archive of past displayed works which are "sold" or "not for sale"
Professional Tools:
Artprice
Pictures from Image Archives:
William Frederick Witherington in the Art Renewal Center
William Frederick Witherington at The Athenaeum 
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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