40.8 million print volumes, the University of California library system is home to one of the largest collections of printed materials in the world. On July 27, 2021, all ten campuses went live with a unified online library catalog, UC Library Search. Besides on-campus libraries, the UC system also maintains two regional library facilities (one each for Northern and Southern California), which each accept older items from all UC campus libraries in their respective region. As of 2019, Northern Regional Library Facility is home to 7.4 million items, while Southern Regional Library Facility is home to 6.5 million items. Academic calendar Eight campuses operate on the quarter system, while two (Berkeley and Merced) are on the semester system. However, all five law schools operate on the semester system, as does the David Geffen School of Medicine at UCLA. Academic organization Davis, Los Angeles, Riverside, and Santa Barbara all followed Berkeley's example by aggregating the majority of arts, humanities, and science departments into a relatively large College of Letters and Science. Therefore, at Berkeley, Davis, Los Angeles, and Santa Barbara, their respective College of Letters and Science is by far the single largest academic unit on each campus. The College of Letters and Science at Los Angeles is the largest academic unit in the entire UC system. Riverside later separated the natural sciences and kept only social sciences grouped with arts and humanities, an example followed by Merced at its founding. Due to President Kerr's interest in not reproducing the impersonal undergraduate experience often seen in such gigantic academic units, San Diego and Santa Cruz both implemented residential college systems inspired by British models (in which each college has distinctive general education requirements reflecting its chosen theme) and grouped most academic departments into a small number of broadly defined divisions which are all independent of the colleges. Finally, Irvine is organized into 13 schools and San Francisco is organized into four schools, all of which are relatively narrow in scope. Admissions Each UC campus handles admissions separately, but a student wishing to apply for an undergraduate or transfer admission uses one application for all UC campuses. Graduate and professional school admissions are handled directly and separately by each department or program to which one applies. In May 2020, UC approved plans to suspend standardized testing score requirements in admissions until 2024. In May 2021, after a student lawsuit, the University of