Well, prior to coming to Pomyville, Twilight was a stuck up bitch with a private book collection, so if anyone knew how books are actually organized it’d be Spike.
She probably didn’t think there’d be an entire book about them. I’d guess she checked a lot of books starting with “Eq”, like “Equestrian Mythology of the First Century.”
Oh, right.
Oh, right! because Encyclopedia is under E also, right.
episode 2 , the book about the Elements of harmony