Paintings in Museums and Public Art Galleries:
Museum of Fine Arts, Boston  Watercolor collection online
Brooklyn Museum of Art, New York City (Undocumented Feature: In many cases the raw JPG image is much larger than displayed on the screen)
Crocker Art Museum, California Little Miss San Francisco, 1853
Crocker Art Museum, California The Love Chase, 1869
Crocker Art Museum, California The Romans and the Sabines: The Abduction, 1870
Crocker Art Museum, California The Romans and the Sabines: The Captivity, 1871
Crocker Art Museum, California The Romans and the Sabines: The Invasion, 1871
Crocker Art Museum, California Sunday Morning in the Mines, 1872
Crocker Art Museum, California The Fandango, ca.1873
Charles Christian Nahl in the Los Angeles County Museum of Art Database
Oakland Museum of California Fire in San Francisco Bay, 1856 Little Miss San Francisco Miners in the Sierra, 1851 Portrait of Jane Eliza Steen Johnson, 1858 Sunday Morning in the Mines, 1872
Charles Christian Nahl at the Smithsonian American Art Museum, Washington D.C.
Virtual Museum of Canada Miners in the Sierras, 1851-52
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:
Charles Christian Nahl at CGFA 
California State University WorldImages Database 
Charles Christian Nahl at The Athenaeum  4 works online by Nahl
Articles:
Union List of Artist Names (Getty Museum) Reference sheet with basic information about the artist and pointers to other references.
Resource Library Magazine Jane Eliza Steen Johnson, 1858
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