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Project Gutenberg cites Chpater 42 as being Tom Sawyer Wounded.—The Doctor's Story.—Tom Confesses.—Aunt Polly Arrives.—Hand Out Them Letters (it also has great illustrations from the original novel with each chapter).
The title's appeal would lay with an inital concern for Tom. Tom is a lovable character, and without him we wouldn't be reading about Huck. Knowing that he was wounded and that he confesses immediately draws the readers attention.
The Adventures of Huckleberry Finn is a story about freedom--more specifically, the freedom of adventure. This seems to be the appeal of the title to a middle class who has very little of either.