Check out the Kindle version of Mark Twain: A Life :
In Mark Twain, Ron Powers consummates years of thought and research with a tour de force on the life of our culture’s founding father, re-creating the 19th century’s vital landscapes and tumultuous events while restoring the human being at their center. He offers Sam Clemens as he lived, breathed, and wrote — drawing heavily on the preserved viewpoints of the people who knew him best (especially the great William Dean Howells, his most admiring friend and literary co-conspirator), and on the annals of the American 19th century that he helped shape. Powers’s prose rivals Mark Twain’s own in its blend of humor, telling detail, and flights of lyricism. With the assistance of the Mark Twain Project at Berkeley, he has been able to draw on thousands of letters and notebook entries, many only recently discovered.