| The Element Encyclopedia of Ghosts and Hauntings: The Ultimate A-Z of Spirits, Mysteries and the Paranormal |
2008 |
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| The Element Encyclopedia of the Psychis World: The Ultimate A-Z of Spirits, Mysteries and the Paranormal |
2006 |
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| The Element Encyclopedia of Vampires: An A-Z of the Undead |
2009 |
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