Magic Treehouse: Dinosaurs Before Dark (Book 1) by Mary Pope Osborne

Magic Tree House Book 1 Dinosaurs Before Dark
(c) 1992 by Mary Pope OsborneMagic Treehouse Dinosaurs Before Dark begins the fantastic series of over thirty books by Mary Pope Osborne.

In the first book, Jack and Annie find the magic treehouse for the first time, and are transported back to the time of the dinosaurs! As they explore, Jack finds a mysterious medallion in the grass with the letter M on it, and they wonder what it could mean. But before long, their attention is diverted by a dangerous T-Rex! How do they escape this ferocious monster? Read the book and find out!