Stan Gordon

Astonishing Encounters: Pennsylvania's Unknown Creatures, Casebook 3 - Stan Gordon

Really Mysterious Pennsylvania: UFOs, Bigfoot & Other Weird Encounters Casebook One - Stan Gordon

Creepy Cryptids and Strange UFO Encounters of Pennsylvania. Bigfoot, Thunderbirds, Mysteries of the Chestnut Ridge and More. Casebook Four - Stan Gordon

Silent Invasion: The Pennsylvania UFO-Bigfoot Casebook - Stan Gordon