Pennsylvania's Unexplained Mysteries: Ghosts, UFOs, Cryptids, & More (Unexplained Encounters): 9798555569134: Urban, Tony: Books - Amazon.com
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Geoffrey A. Fowler on Twitter: "@washingtonpost Bard can sometimes cite and link to a source -- here a Wikipedia entry about UFOs. https://t.co/n2CH1JqnsI" / Twitter
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Explaining the Unexplained: Mysteries of the Paranormal: Eysenck, H. J., Sargent, Carl: 9780297780687: Amazon.com: Books
16 Disturbing Mysteries That Still Remain Unsolved
