Amherst is a member of the Five Colleges consortium, which allows its students to attend classes at four other Pioneer Valley institutions. These include Mount Holyoke College, Smith College, Hampshire College, and the University of Massachusetts Amherst. In addition to the 850 courses available on campus, Amherst students have an additional 5,300 classes to consider through the Consortium (without paying additional tuition) and access to 8 million library volumes. The Five Colleges are geographically close to one another and are linked by buses that run between the campuses.