Used book – The Magic School Bus, Vol. 01: In the Time of the Dinosaurs!, Yves Besnier, Josette Gontier

Raphaël found a fossilized dinosaur tooth among his great-great-uncle's belongings. His great-great-uncle was a paleontologist. He doesn't know which dinosaur the tooth belonged to. Miss Bille-en-Tête suggests that the whole class take a trip to the Natural History Museum. But a mishap with the magical bus's onboard computer sends them back to the age of dinosaurs.