Museums and Public Art Galleries:
 Musée d'Orsay Collection Database, Paris
Addison Gallery of American Art, Andover, Massachusetts
Bowdoin College Museum of Art, Maine (Zoomable)
Winslow Homer in N.Y., 1880
Cincinnati Art Museum, Ohio
(You may need to click "I accept these terms")
Sarah Bernhardt as Frou-Frou, 1880
Currier Gallery of Art, New Hampshire
Harvard University Art Museums, Massachusetts NEW!
National Portrait Gallery, London, UK
The Huntington Library, California
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)
Articles and Reference Sites:
Answers.com reference works 
See the "Photography Encyclopedia" entry, which is actually from The Oxford Companion to the Photograph (2005)
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
The New York Times
"The Compassion of Peter Sekaer"
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