Ancient Rome and Pompeii: A Nonfiction Companion to Magic Tree House #13: Vacation Under the Volcano (Magic Tree House: Fact Trekker Book 14)

Vacation Under the Volcano (Magic Tree House Book 13)

Ancient Greece and the Olympics: A Nonfiction Companion to Magic Tree House #16: Hour of the Olympics (Magic Tree House (R) Fact Tracker)

Leonardo da Vinci: A Nonfiction Companion to Magic Tree House Merlin Mission #10: Monday with a Mad Genius (Magic Tree House (R) Fact Tracker)

China: Land of the Emperor's Great Wall: A Nonfiction Companion to Magic Tree House #14: Day of the Dragon King (Magic Tree House (R) Fact Tracker)

Ninjas and Samurai: A Nonfiction Companion to Magic Tree House #5: Night of the Ninjas (Magic Tree House (R) Fact Tracker)

Hour of the Olympics (Magic Tree House Book 16)

Knights and Castles: A Nonfiction Companion to Magic Tree House #2: The Knight at Dawn (Magic Tree House (R) Fact Tracker)

Space: A Nonfiction Companion to Magic Tree House #8: Midnight on the Moon (Magic Tree House (R) Fact Tracker)

Vikings: A Nonfiction Companion to Magic Tree House #15: Viking Ships at Sunrise (Magic Tree House (R) Fact Tracker)