| The Phoenix from Tucson |
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| The Poltergeist's Haunting |
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| The Respiratory System |
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| The Rising Tide of Lava: Chaos on Mars |
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| The Sad and Laggin' Dragon |
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| The Sand Seas of Mars: Repairing the Rover |
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| The Secret Society of Monster Hunters (16 titles) |
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| The Skeletal and Muscular Systems |
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| The Sky Is Falling: Impact Earth |
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| The STEM Files (8 titles) |
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| The Stinky Sphinx |
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| The Stolen Kraken |
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| The Terrible Toll of the Transylvanian Troll |
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| The Unicorn with the Candy Corn Horn |
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| The Vampire and the Lost Locket |
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| The Vampire's Life Source |
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| The Werewolf's Curse |
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| The Yeti Who Coughed Up Confetti |
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| Top Secret: ChemX |
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| Top Secret: Crypto |
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