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The Guide to the Territories of Halla is a book written by D.J MacHale. It tells about the territories of Denduron, Cloral, First Earth, Veelox, and Eelong. This book also provides information on the territories including their era, landmass, population and more. The Travelers are in the book as well as other characters such as Maximillian Rose, Nancy Olsen, Winn Farrow, and Dr. Zetlin.

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