مجموعه مجموعه قصه های هاردی بویز ، کتاب 4 : هم اتاقی گم شده

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The Missing Chums is volume 4 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap. The book ranks 108th on Publishers Weekly's All-Time Bestselling Children's Book List for the United States, with 1,189,973 copies sold as of 2001.