The W. E. B. Du Bois Library is one of the four libraries of the UMass Amherst Libraries at the University of Massachusetts Amherst in Amherst, Massachusetts. The others are the Science and Engineering Library, the Music Reserve Lab, and the Image Collection Library. The W.E.B. Du Bois Library is the main library on campus, with resources primarily in humanities and social and behavioral sciences. At 28 stories and 308.5 feet (92.32 m) tall, it is the tallest library in the world, and it is the tallest university library in the world. It is also the 23rd tallest educational building in the world. The building is so large that it needs a security force, which is managed by various supervisors and student employees.