Paintings in Museums and Public Art Galleries:
Royal Academy of Arts Collection, London, UK
Ashmolean Museum at the University of Oxford, UK
Beaverbrook Art Gallery, New Brunswick
Glasgow Museums, Scotland Two Strings to Her Bow
Manchester City Art Gallery, UK
National Portrait Gallery, London, UK
Tate Gallery, London, UK
Smithsonian Institution Art Inventories List of works nationwide from two sources: the Inventory of American Paintings Executed before 1914 and the Inventory of American Sculpture (only a few percent of listings have an accompanying image)
Commercial Galleries:
Peter Nahum At The Leicester Galleries, London, UK Archive of past displayed works which are "sold" or "not for sale"
Pictures from Image Archives:
John Pettie in the Art Renewal Center
John Pettie at CGFA 
John Pettie at ArtMagick
Other Web Sites:
Shakespeare Illustrated
The Modernist Journals Project
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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