A person who is obsessive over books. Unlike a bibliophile, and bibliomaniac does not have a defined and concise collection, but rather obsesses over having every single book possible, and gives preference to signed books or other books of value; ie. Antique books. Additionally, a bibliomaniac can and does give justification for having more than one copy of the same book.
1) Steve is a total bibliomaniac, he's always buying all these books just cause they're on sale, and gives books preference over his food budget.
2) Yomiko's house is filled to the brim with books. She's a total bibliomaniac.
3) Maggie and Michelle are true bibliomaniacs, they've got 14 copies of Jane Eyre, and 19 reasons why they should.