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Horace and Morris but Mostly Dolores by James Howe

Horace, Morris, and Dolores have been best friends forever. They do everything together -- from sailing the seven sewers to climbing Mount Ever-Rust. But one day Horace and Morris join the Mega-Mice (no girls allowed), and Dolores joins the Cheese Puffs (no boys allowed). Is this the end? Or will Horace and Morris but mostly Dolores find a way to save the day -- and their friendship?

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