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.
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.
The Pentagon Spy is the 61st title of the Hardy Boys series., written by Franklin W. Dixon. Grosset & Dunlap published this book in 2005.
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.