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The Case of the Flying Phantom (New Adventures of Mary-Kate & Ashley, No. 18)
ISBN 0061065919 / 9780061065910 / 0-06-106591-9
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Ashley and Mary-Kate are having a terrific time on a family vacation in Washington, D.C. They especially like spending time at the Smithsonian Air and Space Museum. But during their visit, the famous Wright Brothers' plane starts to tremble--and spooky voices float down from the cockpit! Could there be a ghost in the machine? Mary-Kate and Ashley are on the case! [via]