The Book Thing of Baltimore is one of the best discoveries I've made living in Baltimore. This operation was started in order to redistribute books from people that have them to people that want them. They take donations of books from individuals, businesses, and libraries. They then sort and shelve them, and then give them away for FREE to anyone who comes. They have tens of thousands of books; everything from mathematics textbooks to Steven King novels. And every single one of them is entirely free. Every Saturday & Sunday, they're open from 9am to 6pm. Also, every Wednesday, starting at 3pm, they appreciate volunteers to help sort and shelve books.