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The exhibit, entitled "Imprint: From Walden to Graceland, 200 Years of Asian Spiritual Traditions in Western Thought", contains Asian volumes from the likes of Henry David Thoreau, Elvis Presley and Ralph Waldo Emerson. Twain's contribution is the 1889 book Aryan Sun-Myths: The Origins of Religions.
Best of all, the book actually contains some of Twain's own hand-written notes in the margins, such as this gem on the nature of "saviors" throughout history: "I feel an honest reverence [for saviors] … I was only meaning to slur those liars their followers."