Paintings in Museums and Public Art Galleries:
Minneapolis Institute of Arts, Minnesota  Prosit! Portrait of Alvina Roosen, 1906 Rainy Evening on Hennepin Avenue, ca.1902
Minneapolis Institute of Arts, Minnesota  8 works online
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)
Professional Tools:
Artprice
Pictures from Image Archives:
Robert Koehler in the Art Renewal Center
Wikimedia Commons Image Database 
Articles:
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 Biographical info
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