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The Bombay Boomerang is Volume 49 in the original The Hardy Boys Mystery Stories published by Grosset & Dunlap. This book was written for the Stratemeyer Syndicate by Vincent Buranelli in 1970.
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Mystery of the Samurai Sword is the 60th title of the Hardy Boys series, written by Franklin W. Dixon. Grosset & Dunalp printed the book in 2005.
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The Pentagon Spy is the 61st title of the Hardy Boys series., written by Franklin W. Dixon. Grosset & Dunlap published this book in 2005.
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The Mystery of Smugglers Cove is the 64th title of the Hardy Boys series, written by Franklin W. Dixon. Grosset & Dunlap published the book in 2005.