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Abdullah Frères, Mark Twain, 1867, Washington D.C, Library of Congress.
Mark Twain
Grand Canal and Doges' Palace by moonlight, Venice Italy, ca. 1890 - 1900, Washington D.C, Library of Congress
Grand Canal by Moonlight, Venice Italy, ca. 1980 - 1900, Washington D.C, Library of Congress
Mark Twain, from 'American Portraits 1875 - 1900' by Gamaliel Bradford, 1922, Boston and New York