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Grey Matter

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The Grey Matter book series by Anthony S. Parker includes books Grey Matter Series Volume 1:: The Story of Mark Trogmyer in the World of the Unknown, Grey Matter Series Volume 2: The Wrath of Nerogroben, Grey Matter Series Volume 3: Secrets of the World of the Unknown, and several more. See the complete Grey Matter series book list in order, box sets or omnibus editions, and companion titles.
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