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Rottweiler on Olfactory Manifestations  is a rare book that is part of the world's largest collection of books on supernatural phenomenon, compiled by Charles Foster Hearse. It appears to be focused on manifestations that exhibit strong odors.
Ray Stantz once saw Hearse's collection on an episode of "Haunts of the Rich and Famous" and always wanted to see the books up close.  He got his chance during a Ghost Hunter of the Year challenge. However, Ray's dream come true was interrupted when the ghost of Charles Foster Hearse appeared behind him.
- On page 15 of Ghostbusters Volume 2 Issue #18, the Rottweiler on Olfactory Manifestations makes a non-canon cameo in Egon's possession.
- ↑ Ray Stantz (2009). The Real Ghostbusters - "Ghostbuster of the Year" (1987) (DVD ts. 12:17-12:20). Time Life Entertainment. Ray says: "Rasputin's Spiritual Exercises. Rottweiler on Olfactory Manifestations."
- ↑ Ray Stantz (2009). The Real Ghostbusters - "Ghostbuster of the Year" (1987) (DVD ts. 10:16-10:20). Time Life Entertainment. Ray says: "I've wanted to look at this library ever since I saw it on "Haunts of the Rich & Famous"."