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The Apeman's Secret is the 62nd title of the Hardy Boys series, written by Franklin W. Dixon. Grosset & Dunlap published the book in 2005.
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The Arctic Patrol Mystery is Volume 48 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap. This book was written for the Stratemeyer Syndicate by Andrew E. Svenson in 1969.
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The Billion Dollar Ransom is the 73rd title of the Hardy Boys series, written by Franklin W. Dixon.
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