The Test of Time (Geronimo Stilton Journey Through Time #6), by Stilton, Geronimo
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- ISBN: 9781338306194 | 1338306197
- Cover: Hardcover
- Copyright: 1/29/2019
Professor Volt's first time machine somehow made it to the present and must be escorted back in time as soon as possible, before it alters the course of history!