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Galileo and his Studies of Medieval Poltergeist is a book that features Galileo Galilei's observations on the paranormal during the Middle Ages.
In an effort to learn more about the paranormal activity the Extreme Ghostbusters have and could investigate, Kylie Griffin started reading up on the subject. She read at least some of "Galileo and his Studies of Medieval Poltergeist" before being interrupted by Eduardo Rivera and Slimer. Slimer got slime all over it but "cleaned" it up in his mouth.
- On page eight of Ghostbusters Volume 2 Issue #15, Galileo and his Studies of Medieval Poltergeist makes a non-canon cameo on the lower shelf behind Kylie Griffin.
- In Ghostbusters International #2, on page 11, on the lower shelf behind Kylie Griffin, the Galileo and His Studies of Medieval Poltergeist makes a non-canon cameo.