Gloria Skurzynski

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The Clones: The Virtual War Chronologs--Book 2 (The …

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Deadly Waters (National Park's Mysteries Series, 4)

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Escape from fear

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Manwolf

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Out Of The Deep (Mysteries in Our National Park)

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Are We Alone? : Scientists Search for Life in Space

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Ghost Horses: A Mystery in Zion National Park

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Martin by Himself

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Mysteries in Our National Parks

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Rage Of Fire (Mysteries in Our National Park)