Museums and Public Art Galleries:
William Dunlap at the Metropolitan Museum of Art, New York City  John Adams Conant, 1829 Mrs. John Adams Conant, 1829
William Dunlap at the National Gallery of Art, Washington D.C. Samuel Griffin, ca.1809
Addison Gallery of American Art, Andover, Massachusetts
Brooklyn Museum, New York City NEW!
Cleveland Museum of Art, Ohio
Harvard University Art Museums, Massachusetts NEW!
Princeton University Art Museum, New Jersey NEW!
William Dunlap at the Smithsonian American Art Museum, Washington D.C.
U.S. Senate Art Collection George Washington
Worcester Art Museum, Massachusetts George Spalding, 1826
National Art Databases and Museum Inventories:
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)
Pictures from Image Archives:
William Dunlap in the Art Renewal Center
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.
Dictionary of Art Historians NEW!  Biographical entry with emphasis on the subject's contribution to the art historical research
Oxford Dictionary of Art (eNotes) NEW! 
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