Silent Invasion: The Pennsylvania UFO-Bigfoot Casebook
by Stan Gordon,Roger Marsh,Michael Coe
ISBN 13: 9780966610833
Format: Illustrated (348 pages) Publisher: Stan Gordon Productions Published: 30 Oct 2010
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Astonishing Encounters: Pennsylvania's Unknown Creatures, Casebook 3 (3)
by Stan Gordon,Michael Coe
ISBN 13: 9780966610840
Format: Illustrated (146 pages) Publisher: Stan Gordon Productions Published: 26 Aug 2015