Wild West: A Nonfiction Companion to Magic Tree House #10: Ghost Town at Sundown: 38 (Magic Tree House (R) Fact Tracker)

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

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