Question: when did the first magic tree house book come out
Answer: # Title Published Story Arc Place Origin Plot Summary / Notes Dinosaurs Before Dark ( UK Title : Valley of the Dinosaurs ) 000000001992 - 07 - 28 - 0000 July 28 , 1992 In the mystery of the Treehouse # 1 Jack and Annie discover the tree house and , using the magical books there , they travel back to the late Cretaceous period ( 65 million years ago ) where they meet a Pteranodon that saves them from a Tyrannosaurus rex .