Penguins and Antarctica: A Nonfiction Companion to Magic Tree House Merlin Mission #12: Eve of the Emperor Penguin (Magic Tree House: Fact Trekker Book 18)

Eve of the Emperor Penguin (Magic Tree House Book 40)

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

Sea Monsters: A Nonfiction Companion to Magic Tree House #39: Dark Day in the Deep Sea (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)

Danger in the Darkest Hour (Magic Tree House (R) Super Edition)

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

National Geographic Readers: Penguins!