The university library is located on the south-west side of the main quadrangle. The collection consists of over one million books and periodicals and more than 800,000 microfilms, microfiche, cassettes and discs. The majority of these items are on open shelves. The map library, with 140,000 maps and atlases, is housed in the Loeb Building, room D299. The library's main (or second) floor contains the reference and information, documents, circulation and interlibrary loans services. The first floor houses books and periodicals in science and technology, the audio-visual room and photocopy services; the third contains books and periodicals in the humanities. On the fourth floor is the social science collection, with micro services (micro-fiche/film formats) and a student microcomputer room. The fifth floor contains the special collections and archives, theses, and the remainder of the collection. Seating is available on all floors. The library is governed by Senate-approved regulations, full copies of which are available at the circulation desk. Alumni of Carleton University, on payment of an appropriate fee, may purchase a borrower's card on an annual basis which will allow for limited borrowing privileges. Undergraduate students may borrow for two weeks. Graduate students and students in the fourth year may borrow for four weeks, but books are subject to recall if requested by another patron after the first two weeks. Books placed on reserve may be borrowed for five days only, overnight, or on an hourly basis. Registered students are able to borrow materials in person at other Ontario university libraries. Users may enquire about this direct borrowing program at the circulation desk. The library also participates in IUBP (Inter-University Borrowing Program) and issues cards to students wishing to borrow from Quebec universities. The Center for Research Libraries, considered an extension of the university library, offers students access to their library materials through the interlibrary loans department. The library collection is protected against theft by an electronic book detection system. As a condition of use of the library, all users must submit books, briefcases, bags, etc. for inspection at the exit if requested to do so. Late return fees and billing costs are charged for overdue books and, as noted under "Delinquent Accounts", examination grades and transcripts will be withheld from students owing money to the university.