Polar Bears and the Arctic: A Nonfiction Companion to Magic Tree House #12: Polar Bears Past Bedtime (Magic Tree House: Fact Trekker Book 16)

Polar Bears Past Bedtime (Magic Tree House Book 12)

Dolphins and Sharks: A Nonfiction Companion to Magic Tree House #9: Dolphins at Daybreak (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)

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

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

Rain Forests: A Nonfiction Companion to Magic Tree House #6: Afternoon on the Amazon (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)

Sabertooths and the Ice Age: A Nonfiction Companion to Magic Tree House #7: Sunset of the Sabertooth (Magic Tree House (R) Fact Tracker)