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Sam Clemens' signature appears to be on Mark Twain Cave wall
In this Aug. 6, 2019 photo provided by David Leaning Samuel Clemens' signature is seen inside the Mark Twain Cave in Hannibal, Mo., Clemens' boyhood home. Experts say it is almost certainly an authentic signature made by Clemens during his youth in Hannibal. (Photo Courtesy David Leaning via AP)
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