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The Not-So-Jolly Roger by Jon Scieszka (1991)
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Amazon.com Product Description (ISBN 0142400459, Paperback)
Everyone’s favorite time-travelers are changing their styles! The Time Warp Trio series now features a brand-new, eye-catching design, sure to appeal to longtime fans, and those new to Jon Scieszka’s wacky brand of humor.
(retrieved from Amazon Thu, 12 Mar 2015 18:11:53 -0400)
Once again, three friends are sent back in time by a magic book and they find themselves prisoners of the evil pirate Blackbeard.
(summary from another edition)