The Giant Yo-Yo Mystery
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15
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The Aldens are helping one of Grandfather's friends break a world record by building the world's largest yo-yo! But someone follows them, and then the plans for the yo-yo turn up missing. Someone is trying to sabotage the yo-yo before it's launched!
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3 primary booksThe Boxcar Children Mysteries is a 3-book series with 3 primary works first released in 1970 with contributions by Gertrude Chandler Warner and Robert Papp.
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