Guttenberg Demonography

In The Freshman (Buffy, season 4, ep. 1), Giles asserts that he has got a big day ahead of him because his "friend has recently acquired an original Gutenberg Daemonographe."

Johannes Gutenberg is credited with inventing the hand-press printing process (using moveable type, oil-based ink, and a wooden press) in the mid-fifteenth century. The great specimens of his legacy are the 21 extant copies (and myriad loose leaves) of the first work known to have been printed using this process, commonly called the Gutenberg Bible (or 42-line Bible).