The county library can bring books in for self-study. Because generally speaking, county libraries have corresponding study rooms, and these study rooms are specially used for self-study, so you can bring your own books. Go in and study for yourself, because your books are different from those in the library. All the books in the library are coded and you can't take them out. But your books can be brought in without codes, so the county library can bring books in for self-study.