There are approximately 92,000 books in the Des Plaines Campus Library and 15,000 books in the Ray Hartstein Campus Library. Books are arranged by the Library of Congress Classification System. Reference books, atlases, and oversize books are shelved separately. Find books by using the library catalog on the computer. Books owned by many college and university libraries in Illinois are also on the computer.  Ask the reference librarian for help. Books owned by local area public libraries are included in another library database on the computer.