You might try the "big guns" of Mark Twain.
The Tom Sawyer sequence, A Connecticut Yankee in King Arthur's Court, Roughing It.
On the Sci-Fi vein, I can recommend just about anything from Eric Frank Russel (if you can find them); Heinlein Juveniles (which are far more complex that a standard "juvenile"). You may not have likes Asimov's Foundation series (I not really a fan of them myself), But try I, Robot or The Caves Of Steel.
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