Dr. P's Extraordinary Guide To Magic & Mystery

Dr. P's Extraordinary Guide To Magic & Mystery is a book or encyclopedia that Marcy found in a public library in Los Angeles on Earth in the first scenes of the episode, "True Colors". The book even has some details of the Calamity Box that says: "Travel to other worlds".

Trivia

 * The characters Bill Cipher and Goliath, from Gravity Falls and Gargoyles respectively, each appear on one of the book's pages. Both characters were respectively voiced in their shows by Alex Hirsch and Keith David, the voices of Curator Ponds and King Andrias respectively.