In 1936, the Heritage Press, a publisher of fine editions, commissioned Norman Rockwell to illustrate Mark Twain's Adventures of Tom Sawyer; four years later, they asked him to illustrate The Adventures of Huckleberry Finn as well. For each book, Rockwell created eight full-color paintings and numerous pen-and-ink drawings, the product of extensive on-the-ground research in Twain's hometown of Hannibal, Missouri. Famously, Rockwell even tried to...