The Philadelphia adventure / Lloyd Alexander.
In 1876, on the eve of the Centennial Exposition in Philadelphia, twenty-year-old Vesper Holly and her friends clash yet again with the archfiend Dr. Helvitius, whose evil schemes plunge them into danger in the wild Pennsylvania countryside.
New York :
Dutton Children's Books,
Walker Library - Curriculum Collection - Juvenile - 3rd Floor
Pull and Hold