When Erin Gilbert noticed that the locations of the cases made two lines on the map, Jillian Holtzmann brought out the Ley Lines: of North America book from a cardboard box to compare. She found the map of New York and presented it. It turned out that the book's Ley Lines map of the city matched the drawn lines, verifying they were Ley Lines.
Loftur Þorsteinsson brought a copy of "Ley Lines" with him to Central Park while he waited for a midnight appointment with the Ghostbusters at Umpire Rock. A young girl dressed like Thor noticed Loftur's book. Loftur told her it was about magic and asked her if she believed in it. The girl's mother informed her it was time for dinner and they should leave him alone. Loftur lamented there was no belief in magic anymore but that would change soon. Loftur's copy was lost in Hell after Jenny Moran cast a spell from the Rauoskinna. Abby Yates recognized Ley Lines: of North America among the reference material that Kylie Griffin brought out after a dimensional overlap took place.
- Cities/states seen when Holtzmann was flipping through the book included:
- Chicago, IL
- New Jersey
- Staten Island, NY
- Manhattan, NY
- On page 20 of Ghostbusters 101 #1, below the Mercado photographs are the Ley Line map pages from the 2016 movie.
- Ghostbusters (2016 Movie)
- Deleted Scenes
- IDW Comics