mary pope osborne & natalie pope boyce

magic tree house fact tracker: ancient greece and the olympics (a nonfiction companion to magic tree house #16 hour of the olympics)

magic tree house fact tracker: ancient rome and pompeii (a nonfiction companion to vacation under the volcano)

magic tree house research guide: sea monsters (a nonfiction companion to dark day in the deep sea)

magic tree house fact tracker research guide: ghosts (a nonfiction companion to a good night for ghosts)

magic tree house research guide: polar bears and the arctic (a nonfiction companion to polar bears past bedtime)

magic tree house research guide: rain forests (a nonfiction companion to afternoon on the amazon)

magic tree house research guide: dolphins and sharks (a nonfiction companion to dolphins at daybreak)

magic tree house: magic tricks from the magic tree house (a fun companion to hurry up, houdini!)